Revert 186643 - Caused a 10% regression on SunSpider benchmark

chrome/renderer/extensions/content_watcher.cc

Index: chrome/renderer/extensions/content_watcher.cc
===================================================================
--- chrome/renderer/extensions/content_watcher.cc	(revision 186747)
+++ chrome/renderer/extensions/content_watcher.cc	(working copy)
@@ -16,13 +16,11 @@
 namespace extensions {
 
 namespace {
-
 class MutationHandler : public ChromeV8Extension {
  public:
   explicit MutationHandler(Dispatcher* dispatcher,
-                           v8::Handle<v8::Context> v8_context,
                            base::WeakPtr<ContentWatcher> content_watcher)
-      : ChromeV8Extension(dispatcher, v8_context),
+      : ChromeV8Extension(dispatcher),
         content_watcher_(content_watcher) {
     RouteFunction("FrameMutated",
                   base::Bind(&MutationHandler::FrameMutated,
@@ -33,7 +31,7 @@
   v8::Handle<v8::Value> FrameMutated(const v8::Arguments& args) {
     if (content_watcher_) {
       content_watcher_->ScanAndNotify(
-          WebKit::WebFrame::frameForContext(v8_context()));
+          WebKit::WebFrame::frameForCurrentContext());
     }
     return v8::Undefined();
   }
@@ -48,10 +46,9 @@
       dispatcher_(dispatcher) {}
 ContentWatcher::~ContentWatcher() {}
 
-scoped_ptr<NativeHandler> ContentWatcher::MakeNatives(
-    v8::Handle<v8::Context> v8_context) {
-  return scoped_ptr<NativeHandler>(new MutationHandler(
-      dispatcher_, v8_context, weak_ptr_factory_.GetWeakPtr()));
+scoped_ptr<NativeHandler> ContentWatcher::MakeNatives() {
+  return scoped_ptr<NativeHandler>(
+      new MutationHandler(dispatcher_, weak_ptr_factory_.GetWeakPtr()));
 }
 
 void ContentWatcher::OnWatchPages(