Make blink_trybot recipe work on windows

scripts/slave/recipes/blink_trybot.expected/mac_success_debug.json

 [
   {
-   "cmd": ["[DEPOT_TOOLS_ROOT]/gclient", "config", "--spec", "deps_os = {}\nhooks = []\nsolutions = [{'custom_deps': {'src/third_party/WebKit': 'svn://svn-mirror.golo.chromium.org/blink/trunk'}, 'custom_vars': {'googlecode_url': 'svn://svn-mirror.golo.chromium.org/%s', 'nacl_trunk': 'svn://svn-mirror.golo.chromium.org/native_client/trunk', 'sourceforge_url': 'svn://svn-mirror.golo.chromium.org/%(repo)s', 'webkit_revision': 'HEAD', 'webkit_trunk': 'svn://svn-mirror.golo.chromium.org/blink/trunk'}, 'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'safesync_url': None, 'url': 'svn://svn-mirror.golo.chromium.org/chrome/trunk/src'}]\ntarget_os = []\ntarget_os_only = False"],
+   "cmd": ["python", "-u", "[DEPOT_TOOLS_ROOT]/gclient.py", "config", "--spec", "deps_os = {}\nhooks = []\nsolutions = [{'custom_deps': {'src/third_party/WebKit': 'https://chromium.googlesource.com/chromium/blink.git'}, 'custom_vars': {'googlecode_url': 'svn://svn-mirror.golo.chromium.org/%s', 'nacl_trunk': 'svn://svn-mirror.golo.chromium.org/native_client/trunk', 'sourceforge_url': 'svn://svn-mirror.golo.chromium.org/%(repo)s', 'webkit_revision': 'HEAD', 'webkit_trunk': 'svn://svn-mirror.golo.chromium.org/blink/trunk'}, 'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'safesync_url': None, 'url': 'https://chromium.googlesource.com/chromium/src.git'}]\ntarget_os = []\ntarget_os_only = False"],
    "name": "gclient setup",
-   "seed_steps": ["gclient setup", "gclient revert", "gclient sync", "apply_issue", "gclient runhooks", "compile", "webkit_unit_tests", "webkit_lint"]
+   "seed_steps": ["gclient setup", "gclient sync", "apply_issue", "gclient runhooks", "compile", "webkit_unit_tests", "webkit_lint"]
   },
   {
-   "cmd": ["python", "[BUILD_ROOT]/scripts/slave/gclient_safe_revert.py", ".", "[DEPOT_TOOLS_ROOT]/gclient"],
-   "name": "gclient revert"
-  },
-  {
-   "cmd": ["[DEPOT_TOOLS_ROOT]/gclient", "sync", "--nohooks"],
+   "cmd": ["python", "-u", "[DEPOT_TOOLS_ROOT]/gclient.py", "sync", "--verbose", "--with_branch_heads", "--nohooks", "--reset", "--delete_unversioned_trees", "--force"],
    "name": "gclient sync"
   },
   {
-   "cmd": ["[DEPOT_TOOLS_ROOT]/apply_issue", "-r", "[SLAVE_BUILD_ROOT]/src/third_party/WebKit", "-i", 12853011, "-p", 1, "-s", "https://chromiumcodereview.appspot.com", "-e", "commit-bot@chromium.org"],
+   "cmd": ["python", "-u", "[DEPOT_TOOLS_ROOT]/apply_issue.py", "-r", "[SLAVE_BUILD_ROOT]/src/third_party/WebKit", "-i", 12853011, "-p", 1, "-s", "https://chromiumcodereview.appspot.com", "-e", "commit-bot@chromium.org", "--no-commit"],
    "name": "apply_issue"
   },
   {
    "cmd": ["[DEPOT_TOOLS_ROOT]/gclient", "runhooks"],
-   "env": {"GYP_DEFINES": "component=shared_library dcheck_always_on=1 fastbuild=1", "GYP_GENERATORS": "ninja", "GYP_GENERATOR_FLAGS": "", "GYP_MSVS_VERSION": ""},
+   "env": {"GYP_DEFINES": "component=shared_library dcheck_always_on=1 fastbuild=1", "GYP_GENERATORS": "ninja", "GYP_GENERATOR_FLAGS": "", "GYP_MSVS_VERSION": null},
    "name": "gclient runhooks"
   },
   {
    "cmd": ["python", "[BUILD_ROOT]/scripts/slave/compile.py", "--target", "Debug", "--build-dir", "[SLAVE_BUILD_ROOT]/src/out", "--build-tool", "ninja", "--compiler", "goma", "--", "all_webkit", "content_shell"],
    "name": "compile"
   },
   {
    "cmd": ["python", "[BUILD_ROOT]/scripts/slave/runtest.py", "--target", "Debug", "--build-dir", "[SLAVE_BUILD_ROOT]/src/out", "--no-xvfb", "--factory-properties", "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Debug\", \"buildername\": \"TestBuilder\", \"buildnumber\": 571, \"config_name\": \"blink\", \"issue\": 12853011, \"mastername\": \"chromium.testing.master\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"blink_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": \"HEAD\", \"rietveld\": \"https://chromiumcodereview.appspot.com\", \"root\": \"src/third_party/WebKit\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}", "--build-properties", "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Debug\", \"buildername\": \"TestBuilder\", \"buildnumber\": 571, \"config_name\": \"blink\", \"issue\": 12853011, \"mastername\": \"chromium.testing.master\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"blink_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": \"HEAD\", \"rietveld\": \"https://chromiumcodereview.appspot.com\", \"root\": \"src/third_party/WebKit\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}", "webkit_unit_tests"],
    "name": "webkit_unit_tests"
   },
   {
-   "cmd": ["python", "[BUILD_ROOT]/scripts/slave/chromium/lint_test_files_wrapper.py", "--build-dir", "[SLAVE_BUILD_ROOT]/src/out", "--target", "Debug"],
+   "cmd": ["python", "-u", "[BUILD_ROOT]/scripts/slave/chromium/lint_test_files_wrapper.py", "--build-dir", "[SLAVE_BUILD_ROOT]/src/out", "--target", "Debug"],
    "name": "webkit_lint"
   },
   {
    "can_fail_build": false,
    "cmd": ["python", "[BUILD_ROOT]/scripts/slave/runtest.py", "--target", "Debug", "--build-dir", "[SLAVE_BUILD_ROOT]/src/out", "--no-xvfb", "--factory-properties", "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Debug\", \"buildername\": \"TestBuilder\", \"buildnumber\": 571, \"config_name\": \"blink\", \"issue\": 12853011, \"mastername\": \"chromium.testing.master\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"blink_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": \"HEAD\", \"rietveld\": \"https://chromiumcodereview.appspot.com\", \"root\": \"src/third_party/WebKit\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}", "--build-properties", "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Debug\", \"buildername\": \"TestBuilder\", \"buildnumber\": 571, \"config_name\": \"blink\", \"issue\": 12853011, \"mastername\": \"chromium.testing.master\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"blink_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": \"HEAD\", \"rietveld\": \"https://chromiumcodereview.appspot.com\", \"root\": \"src/third_party/WebKit\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}", "--run-python-script", "[BUILD_ROOT]/scripts/slave/chromium/layout_test_wrapper.py", "--target", "Debug", "-o", "[SLAVE_BUILD_ROOT]/layout-test-results", "--build-dir", "[SLAVE_BUILD_ROOT]/src/out", "--output-json", "/path/to/tmp/json"],
    "name": "webkit_tests (with patch)"
   },
   {
-   "cmd": ["python", "-c", "print \"ALL IS WELL\""],
+   "cmd": ["python", "-u", "print \"ALL IS WELL\""],
    "name": "webkit_tests"
   }
 ]