[ServiceWorker, PushMessaging] Use ScriptPromiseResolverWithContext.

Source/bindings/v8/ScriptPromiseResolverWithContext.h

 // Copyright 2014 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.
 
 #ifndef ScriptPromiseResolverWithContext_h
 #define ScriptPromiseResolverWithContext_h
 
 #include "bindings/v8/NewScriptState.h"
 #include "bindings/v8/ScopedPersistent.h"
 #include "bindings/v8/ScriptPromise.h"
@@ skipping 44 matching lines @@
     {
         if (m_state != Pending || !executionContext() || executionContext()->activeDOMObjectsAreStopped())
             return;
         m_state = Rejecting;
         NewScriptState::Scope scope(m_scriptState.get());
         m_value.set(m_scriptState->isolate(), toV8(value));
         if (!executionContext()->activeDOMObjectsAreSuspended())
             resolveOrRejectImmediately(&m_timer);
     }
 
+    NewScriptState* scriptState() { return m_scriptState.get(); }
+
     // Note that an empty ScriptPromise will be returned after resolve or
     // reject is called.
     ScriptPromise promise()
     {
         return m_resolver ? m_resolver->promise() : ScriptPromise();
     }
 
     // ActiveDOMObject implementation.
     virtual void suspend() OVERRIDE;
     virtual void resume() OVERRIDE;
@@ skipping 26 matching lines @@
     }
     v8::Handle<v8::Value> toV8(ScriptValue value)
     {
         return value.v8Value();
     }
 
     void resolveOrRejectImmediately(Timer<ScriptPromiseResolverWithContext>*);
     void clear();
 
     ResolutionState m_state;
-    RefPtr<NewScriptState> m_scriptState;
+    const RefPtr<NewScriptState> m_scriptState;
     Timer<ScriptPromiseResolverWithContext> m_timer;
     RefPtr<ScriptPromiseResolver> m_resolver;
     ScopedPersistent<v8::Value> m_value;
 };
 
 } // namespace WebCore
 
 #endif // #ifndef ScriptPromiseResolverWithContext_h