Allow navigations to frames that aren't being unloaded in the unload handler.

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

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 197 matching lines @@
   bool isURLAllowed(const KURL&) const;
   bool shouldReuseDefaultView(const KURL&) const;
   void removeSpellingMarkersUnderWords(const Vector<String>& words);
 
   bool shouldThrottleRendering() const;
 
   // Returns the frame scheduler, creating one if needed.
   WebFrameScheduler* frameScheduler();
   void scheduleVisualUpdateUnlessThrottled();
 
-  bool isNavigationAllowed() const { return m_navigationDisableCount == 0; }
+  bool isNavigationAllowed() const;
 
   InterfaceProvider* interfaceProvider() { return m_interfaceProvider; }
   InterfaceRegistry* interfaceRegistry() { return m_interfaceRegistry; }
 
   FrameLoaderClient* client() const;
 
   PluginData* pluginData() const;
 
   PerformanceMonitor* performanceMonitor() { return m_performanceMonitor; }
 
@@ skipping 148 matching lines @@
   explicit ScopedFrameBlamer(LocalFrame*);
   ~ScopedFrameBlamer();
 
  private:
   Member<LocalFrame> m_frame;
 };
 
 }  // namespace blink
 
 #endif  // LocalFrame_h