Move most of ChromeV8Context to a base ScriptContext

PRESUBMIT.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.
 
 """Top-level presubmit script for Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
@@ skipping 222 matching lines @@
         r'^ppapi[\\\/]tests[\\\/]test_broker\.cc$',
       ),
     ),
     (
       r'/v8::Extension\(',
       (
         'Do not introduce new v8::Extensions into the code base, use',
         'gin::Wrappable instead. See http://crbug.com/334679',
       ),
       True,
-      (),
+      (
+        r'extensions[/\\]renderer[/\\]safe_builtins\.*',
+      ),
     ),
 )
 
 
 _VALID_OS_MACROS = (
     # Please keep sorted.
     'OS_ANDROID',
     'OS_ANDROID_HOST',
     'OS_BSD',
     'OS_CAT',       # For testing.
@@ skipping 1215 matching lines @@
     builders.extend(['cros_x86'])
 
   # The AOSP bot doesn't build the chrome/ layer, so ignore any changes to it
   # unless they're .gyp(i) files as changes to those files can break the gyp
   # step on that bot.
   if (not all(re.search('^chrome', f) for f in files) or
       any(re.search('\.gypi?$', f) for f in files)):
     builders.extend(['android_aosp'])
 
   return GetDefaultTryConfigs(builders)