PlzNavigate: stop navigations when opening a document for write

third_party/WebKit/Source/core/frame/LocalFrameClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2012 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
@@ skipping 324 matching lines @@
     return WebEffectiveConnectionType::TypeUnknown;
   }
 
   // Overwrites the given URL to use an HTML5 embed if possible. An empty URL is
   // returned if the URL is not overriden.
   virtual KURL overrideFlashEmbedWithHTML(const KURL&) { return KURL(); }
 
   virtual BlameContext* frameBlameContext() { return nullptr; }
 
   virtual void setHasReceivedUserGesture() {}
+
+  virtual void abortClientNavigation() {}
 };
 
 }  // namespace blink
 
 #endif  // LocalFrameClient_h