Revert 186643 - Caused a 10% regression on SunSpider benchmark

chrome/renderer/extensions/sync_file_system_custom_bindings.cc

Index: chrome/renderer/extensions/sync_file_system_custom_bindings.cc
===================================================================
--- chrome/renderer/extensions/sync_file_system_custom_bindings.cc	(revision 186747)
+++ chrome/renderer/extensions/sync_file_system_custom_bindings.cc	(working copy)
@@ -13,9 +13,8 @@
 
 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,
@@ -48,8 +47,7 @@
     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));