Set navigationStart correctly for all load types.

content/renderer/render_frame_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 #define CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 509 matching lines @@
       blink::WebLocalFrame* frame) override;
   void didReceiveTitle(blink::WebLocalFrame* frame,
                        const blink::WebString& title,
                        blink::WebTextDirection direction) override;
   void didChangeIcon(blink::WebLocalFrame* frame,
                      blink::WebIconURL::Type icon_type) override;
   void didFinishDocumentLoad(blink::WebLocalFrame* frame) override;
   void runScriptsAtDocumentReady(blink::WebLocalFrame* frame,
                                  bool document_is_empty) override;
   void didHandleOnloadEvents(blink::WebLocalFrame* frame) override;
+  void didHandleOnBeforeUnloadEvent(bool eventListenerCalled) override;
   void didFailLoad(blink::WebLocalFrame* frame,
                    const blink::WebURLError& error,
                    blink::WebHistoryCommitType commit_type) override;
   void didFinishLoad(blink::WebLocalFrame* frame) override;
   void didNavigateWithinPage(blink::WebLocalFrame* frame,
                              const blink::WebHistoryItem& item,
                              blink::WebHistoryCommitType commit_type,
                              bool content_initiated) override;
   void didUpdateCurrentHistoryItem() override;
   void didChangeThemeColor() override;
@@ skipping 758 matching lines @@
   mojom::FrameHostPtr frame_host_;
 
   base::WeakPtrFactory<RenderFrameImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_IMPL_H_