Remove calls to HandleScope default ctor.

Source/web/WebDevToolsFrontendImpl.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 128 matching lines @@
             return;
         }
         m_inspectorFrontendResumeObserver.clear();
         doDispatchOnInspectorFrontend(m_messages.takeFirst());
     }
 }
 
 void WebDevToolsFrontendImpl::doDispatchOnInspectorFrontend(const WebString& message)
 {
     WebFrameImpl* frame = m_webViewImpl->mainFrameImpl();
-    v8::Isolate* isolate = v8::Isolate::GetCurrent();
-    v8::HandleScope scope;
-    v8::Handle<v8::Context> frameContext = frame->frame() ? frame->frame()->script()->currentWorldContext() : v8::Local<v8::Context>();
+    if (!frame->frame())
+        return;
+    v8::Isolate* isolate = frame->frame()->script()->isolate();
+    v8::HandleScope scope(isolate);
+    v8::Handle<v8::Context> frameContext = frame->frame()->script()->currentWorldContext();
     v8::Context::Scope contextScope(frameContext);
     v8::Handle<v8::Value> inspectorFrontendApiValue = frameContext->Global()->Get(v8::String::New("InspectorFrontendAPI"));
     if (!inspectorFrontendApiValue->IsObject())
         return;
     v8::Handle<v8::Object> dispatcherObject = v8::Handle<v8::Object>::Cast(inspectorFrontendApiValue);
     v8::Handle<v8::Value> dispatchFunction = dispatcherObject->Get(v8::String::New("dispatchMessage"));
     // The frame might have navigated away from the front-end page (which is still weird),
     // OR the older version of frontend might have a dispatch method in a different place.
     // FIXME(kaznacheev): Remove when Chrome for Android M18 is retired.
     if (!dispatchFunction->IsFunction()) {
         v8::Handle<v8::Value> inspectorBackendApiValue = frameContext->Global()->Get(v8::String::New("InspectorBackend"));
         if (!inspectorBackendApiValue->IsObject())
             return;
         dispatcherObject = v8::Handle<v8::Object>::Cast(inspectorBackendApiValue);
         dispatchFunction = dispatcherObject->Get(v8::String::New("dispatch"));
         if (!dispatchFunction->IsFunction())
             return;
     }
     v8::Handle<v8::Function> function = v8::Handle<v8::Function>::Cast(dispatchFunction);
     Vector< v8::Handle<v8::Value> > args;
     args.append(v8String(message, isolate));
     v8::TryCatch tryCatch;
     tryCatch.SetVerbose(true);
     ScriptController::callFunctionWithInstrumentation(frame->frame() ? frame->frame()->document() : 0, function, dispatcherObject, args.size(), args.data());
 }
 
 } // namespace WebKit