Refactors parts of gin:

mojo/apps/js/bindings/waiting_callback.cc

 // Copyright 2013 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 "mojo/apps/js/bindings/waiting_callback.h"
 
 #include "gin/per_context_data.h"
 
 namespace mojo {
 namespace js {
@@ skipping 30 matching lines @@
   static_cast<WaitingCallback*>(closure)->OnHandleReady(result);
 }
 
 void WaitingCallback::OnHandleReady(MojoResult result) {
   wait_id_ = 0;
 
   if (!runner_)
     return;
 
   gin::Runner::Scope scope(runner_.get());
-  v8::Isolate* isolate = runner_->isolate();
+  v8::Isolate* isolate = runner_->GetContextHolder()->isolate();
 
   v8::Handle<v8::Value> hidden_value =
       GetWrapper(isolate)->GetHiddenValue(GetHiddenPropertyName(isolate));
   v8::Handle<v8::Function> callback;
   CHECK(gin::ConvertFromV8(isolate, hidden_value, &callback));
 
   v8::Handle<v8::Value> args[] = { gin::ConvertToV8(isolate, result) };
   runner_->Call(callback, runner_->global(), 1, args);
 }
 
 }  // namespace js
 }  // namespace mojo