[oilpan] Don't notify CachedResourceClients of cancel events when detaching the frame.

Source/core/loader/FrameLoader.h

Index: Source/core/loader/FrameLoader.h
diff --git a/Source/core/loader/FrameLoader.h b/Source/core/loader/FrameLoader.h
index 8ac7d21f47a57bb0f8340992b058d618b8daf7a5..718f92be899ab23514519ccccef6e21bcc1fb3f1 100644
--- a/Source/core/loader/FrameLoader.h
+++ b/Source/core/loader/FrameLoader.h
@@ -221,6 +221,7 @@ public:
     void checkCallImplicitClose();
 
     void frameDetached();
+    bool isFrameDetaching();
 
     void setOutgoingReferrer(const KURL&);
 
@@ -420,6 +421,8 @@ private:
 
     KURL m_previousURL;
     RefPtr<HistoryItem> m_requestedHistoryItem;
+
+    bool m_frameDetaching;
 };
 
 // This function is called by createWindow() in JSDOMWindowBase.cpp, for example, for