Move app_host target from c/b/extensions into src/apps.

apps/apps.gypi

Index: apps/apps.gypi
diff --git a/apps/apps.gypi b/apps/apps.gypi
index 257195dde87318f72c6a53174298a965b8791542..76bca7eef411313ddcadd48f8aa5e2551d908b56 100644
--- a/apps/apps.gypi
+++ b/apps/apps.gypi
@@ -44,4 +44,43 @@
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
+  'conditions': [
+    ['OS=="win"', {
+      'targets': [
+        {
+          'target_name': 'app_host',
+          'type': 'executable',
+          'include_dirs': [
+              '..',
+            ],
+          'direct_dependent_settings': {
+            'include_dirs': [
+              '..',
+            ],
+          },
+          'dependencies': [
+            '<(DEPTH)/base/base.gyp:base',
+            '<(DEPTH)/chrome/chrome.gyp:chrome_version_resources',
+            '<(DEPTH)/chrome/chrome.gyp:launcher_support',
+            '<(DEPTH)/google_update/google_update.gyp:google_update',
+          ],
+          'sources': [
+            'app_host/app_host.rc',
+            'app_host/app_host_main.cc',
+            'app_host/app_host_resource.h',
+            'app_host/binaries_installer.cc',
+            'app_host/binaries_installer.h',
+            'app_host/update.cc',
+            'app_host/update.h',
+            '<(SHARED_INTERMEDIATE_DIR)/chrome_version/app_host_exe_version.rc',
+          ],
+          'msvs_settings': {
+            'VCLinkerTool': {
+              'SubSystem': '2',  # Set /SUBSYSTEM:WINDOWS
+            },
+          },
+        },
+      ],
+    },],  # 'OS=="win"'
+  ],  # 'conditions'
 }