Implement NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE.

third_party/WebKit/Source/web/WebLocalFrameImpl.h

 /*
  * Copyright (C) 2009 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 82 matching lines @@
   void setContentSettingsClient(WebContentSettingsClient*) override;
   void setSharedWorkerRepositoryClient(
       WebSharedWorkerRepositoryClient*) override;
   WebSize getScrollOffset() const override;
   void setScrollOffset(const WebSize&) override;
   WebSize contentsSize() const override;
   bool hasVisibleContent() const override;
   WebRect visibleContentRect() const override;
   bool hasHorizontalScrollbar() const override;
   bool hasVerticalScrollbar() const override;
+  void collapse(bool) override;
   WebView* view() const override;
   WebDocument document() const override;
   WebPerformance performance() const override;
   void dispatchUnloadEvent() override;
   void executeScript(const WebScriptSource&) override;
   void executeScriptInIsolatedWorld(int worldID,
                                     const WebScriptSource* sources,
                                     unsigned numSources) override;
   void setIsolatedWorldSecurityOrigin(int worldID,
                                       const WebSecurityOrigin&) override;
@@ skipping 388 matching lines @@
 
 DEFINE_TYPE_CASTS(WebLocalFrameImpl,
                   WebFrame,
                   frame,
                   frame->isWebLocalFrame(),
                   frame.isWebLocalFrame());
 
 }  // namespace blink
 
 #endif