Make it possible for the embedder to run unload handlers in subframes.

Source/core/loader/FrameLoader.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * 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:
  *
@@ skipping 28 matching lines @@
 #include "core/loader/FrameLoaderStateMachine.h"
 #include "core/loader/FrameLoaderTypes.h"
 #include "core/loader/HistoryItem.h"
 #include "core/loader/MixedContentChecker.h"
 #include "platform/Timer.h"
 #include "platform/network/ResourceRequest.h"
 #include "wtf/Forward.h"
 #include "wtf/HashSet.h"
 #include "wtf/OwnPtr.h"
 
+namespace blink {
+class WebViewImpl;
+}
+
 namespace WebCore {
 
 class Resource;
 class Chrome;
 class DOMWrapperWorld;
 class DocumentLoader;
 class Event;
 class FetchContext;
 class FormState;
 class FormSubmission;
@@ skipping 138 matching lines @@
     void saveDocumentAndScrollState();
     void clearScrollPositionAndViewState();
 
     enum RestorePolicy {
         StandardRestore,
         ForcedRestoreForSameDocumentHistoryNavigation
     };
     void restoreScrollPositionAndViewState(RestorePolicy = StandardRestore);
 
 private:
+    friend class blink::WebViewImpl;
+
     bool allChildrenAreComplete() const; // immediate children, not all descendants
 
     void completed();
 
     void checkTimerFired(Timer<FrameLoader>*);
     void didAccessInitialDocumentTimerFired(Timer<FrameLoader>*);
 
     bool prepareRequestForThisFrame(FrameLoadRequest&);
     void setReferrerForFrameRequest(ResourceRequest&, ShouldSendReferrer, Document*);
     FrameLoadType determineFrameLoadType(const FrameLoadRequest&);
@@ skipping 66 matching lines @@
 
     bool m_didAccessInitialDocument;
     Timer<FrameLoader> m_didAccessInitialDocumentTimer;
 
     SandboxFlags m_forcedSandboxFlags;
 };
 
 } // namespace WebCore
 
 #endif // FrameLoader_h