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

masters/master.chromium.webkit/master_linux_webkit_pinned_cfg.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from master import master_config
 from master.factory import chromium_factory
 
 defaults = {}
 
 helper = master_config.Helper(defaults)
@@ skipping 21 matching lines @@
 #
 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',
     ],
     options=[
+      '--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'
+      'test_results_server': 'test-results.appspot.com',
+      'gclient_env': { 'GYP_GENERATORS': 'ninja' },
     }))
 
 def Update(config, active_master, c):
   return helper.Update(c)