Revert 186643 - Caused a 10% regression on SunSpider benchmark

chrome/renderer/extensions/sync_file_system_custom_bindings.cc

 // 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.
 
 #include "chrome/renderer/extensions/sync_file_system_custom_bindings.h"
 
 #include <string>
 
 #include "chrome/common/extensions/extension_constants.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 #include "v8/include/v8.h"
 #include "webkit/fileapi/file_system_util.h"
 
 namespace extensions {
 
-SyncFileSystemCustomBindings::SyncFileSystemCustomBindings(
-    Dispatcher* dispatcher, v8::Handle<v8::Context> v8_context)
-    : ChromeV8Extension(dispatcher, v8_context) {
+SyncFileSystemCustomBindings::SyncFileSystemCustomBindings()
+    : ChromeV8Extension(NULL) {
   RouteFunction(
       "GetSyncFileSystemObject",
       base::Bind(&SyncFileSystemCustomBindings::GetSyncFileSystemObject,
                  base::Unretained(this)));
 }
 
 v8::Handle<v8::Value> SyncFileSystemCustomBindings::GetSyncFileSystemObject(
     const v8::Arguments& args) {
   if (args.Length() != 2) {
     NOTREACHED();
@@ skipping 12 matching lines @@
   if (name.empty()) {
     NOTREACHED();
     return v8::Undefined();
   }
   std::string root_url(*v8::String::Utf8Value(args[1]));
   if (root_url.empty()) {
     NOTREACHED();
     return v8::Undefined();
   }
 
-  WebKit::WebFrame* webframe =
-      WebKit::WebFrame::frameForContext(v8_context());
+  WebKit::WebFrame* webframe = WebKit::WebFrame::frameForCurrentContext();
   return webframe->createFileSystem(WebKit::WebFileSystem::TypeExternal,
                                     WebKit::WebString::fromUTF8(name),
                                     WebKit::WebString::fromUTF8(root_url));
 }
 
 }  // namespace extensions