Switch the Linux bots on chromium.webkit to use Ninja.

masters/master.chromium.webkit/master_linux_webkit_pinned_cfg.py

Index: masters/master.chromium.webkit/master_linux_webkit_pinned_cfg.py
===================================================================
--- masters/master.chromium.webkit/master_linux_webkit_pinned_cfg.py	(revision 172146)
+++ masters/master.chromium.webkit/master_linux_webkit_pinned_cfg.py	(working copy)
@@ -33,25 +33,28 @@
 B('WebKit Linux (deps)', 'f_webkit_linux_rel', scheduler='s3_chromium_rel')
 F('f_webkit_linux_rel', linux().ChromiumFactory(
     tests=[
-      'test_shell',
-      'webkit',
-      'webkit_lint',
-      'webkit_unit',
+        'test_shell',
+        'webkit',
+        'webkit_lint',
+        'webkit_unit',
     ],
     options=[
-      '--compiler=goma',
-      'DumpRenderTree',
-      'test_shell',
-      'test_shell_tests',
-      'webkit_unit_tests',
+        '--build-tool=ninja',
+        '--compiler=goma',
+        '--',
+        'DumpRenderTree',
+        'test_shell',
+        'test_shell_tests',
+        'webkit_unit_tests',
     ],
     factory_properties={
-      'additional_expectations_files': [
-        ['webkit', 'tools', 'layout_tests', 'test_expectations.txt' ],
-      ],
-      'archive_webkit_results': True,
-      'generate_gtest_json': True,
-      'test_results_server': 'test-results.appspot.com'
+        'additional_expectations_files': [
+            ['webkit', 'tools', 'layout_tests', 'test_expectations.txt' ],
+        ],
+        'archive_webkit_results': True,
+        'generate_gtest_json': True,
+        'test_results_server': 'test-results.appspot.com',
+        'gclient_env': { 'GYP_GENERATORS': 'ninja' },
     }))
 
 def Update(config, active_master, c):