Add a BeforeDestroyFrame notification method to WebViewDelegate

webkit/glue/webframe_impl.h

Index: webkit/glue/webframe_impl.h
===================================================================
--- webkit/glue/webframe_impl.h	(revision 15231)
+++ webkit/glue/webframe_impl.h	(working copy)
@@ -217,9 +217,7 @@
 
   static WebFrameImpl* FromFrame(WebCore::Frame* frame);
 
-  WebViewImpl* webview_impl() const {
-    return webview_impl_;
-  }
+  WebViewImpl* GetWebViewImpl() const;
 
   WebCore::FrameView* frameview() const {
     return frame_ ? frame_->view() : NULL;
@@ -304,9 +302,6 @@
   // asynchronously in order to scope string matches during a find operation.
   ScopedRunnableMethodFactory<WebFrameImpl> scope_matches_factory_;
 
-  // This is a weak pointer to our containing WebViewImpl.
-  WebViewImpl* webview_impl_;
-
   // This is a weak pointer to our corresponding WebCore frame.  A reference to
   // ourselves is held while frame_ is valid.  See our Closing method.
   WebCore::Frame* frame_;