Refactoring: Simplify DocumentWriter by reorganizing its lifetime.

Source/core/inspector/InspectorOverlay.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 545 matching lines @@
 
     RefPtr<Frame> frame = Frame::create(m_overlayPage.get(), 0, dummyFrameLoaderClient);
     frame->setView(FrameView::create(frame.get()));
     frame->init();
     FrameLoader* loader = frame->loader();
     frame->view()->setCanHaveScrollbars(false);
     frame->view()->setTransparent(true);
     ASSERT(loader->activeDocumentLoader());
     DocumentWriter* writer = loader->activeDocumentLoader()->beginWriting("text/html", "UTF-8");
     writer->addData(reinterpret_cast<const char*>(InspectorOverlayPage_html), sizeof(InspectorOverlayPage_html));
-    writer->end();
+    loader->activeDocumentLoader()->endWriting(writer);
     v8::HandleScope handleScope;
     v8::Handle<v8::Context> frameContext = frame->script()->currentWorldContext();
     v8::Context::Scope contextScope(frameContext);
     v8::Handle<v8::Value> overlayHostObj = toV8(m_overlayHost.get(), v8::Handle<v8::Object>(), frameContext->GetIsolate());
     v8::Handle<v8::Object> global = frameContext->Global();
     global->Set(v8::String::New("InspectorOverlayHost"), overlayHostObj);
 
 #if OS(WINDOWS)
     evaluateInOverlay("setPlatform", "windows");
 #elif OS(DARWIN)
@@ skipping 56 matching lines @@
 
 void InspectorOverlay::freePage()
 {
     m_overlayPage.clear();
     m_overlayChromeClient.clear();
     m_timer.stop();
 }
 
 } // namespace WebCore