chrome.loadTimes() shouldn't be affected by in-document navigation.

chrome/renderer/page_load_histograms.h

 // Copyright (c) 2011 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 CHROME_RENDERER_PAGE_LOAD_HISTOGRAMS_H_
 #define CHROME_RENDERER_PAGE_LOAD_HISTOGRAMS_H_
 
 #include "base/basictypes.h"
 #include "content/public/renderer/render_view_observer.h"
 
+namespace content {
+class DocumentState;
+}
+
 class RendererHistogramSnapshots;
 
-namespace content {
-class NavigationState;
-}
-
 class PageLoadHistograms : public content::RenderViewObserver {
  public:
   PageLoadHistograms(content::RenderView* render_view,
                      RendererHistogramSnapshots* histogram_snapshots);
 
  private:
   // RenderViewObserver implementation.
   virtual void FrameWillClose(WebKit::WebFrame* frame) OVERRIDE;
   virtual void ClosePage() OVERRIDE;
 
@@ skipping 13 matching lines @@
   //    begin: request if it was user requested, start otherwise
   //
   // It's possible for the request time not to be set, if a client
   // redirect had been done (the user never requested the page)
   // Also, it's possible to load a page without ever laying it out
   // so first_paint and first_paint_after_load can be 0.
   void Dump(WebKit::WebFrame* frame);
 
   void ResetCrossFramePropertyAccess();
 
-  void LogPageLoadTime(const content::NavigationState* state,
+  void LogPageLoadTime(const content::DocumentState* load_times,
                        const WebKit::WebDataSource* ds) const;
 
   // Site isolation metric counts.
   // These are per-page-load counts, reset to 0 after they are dumped.
   int cross_origin_access_count_;
   int same_origin_access_count_;
 
   RendererHistogramSnapshots* histogram_snapshots_;
 
   DISALLOW_COPY_AND_ASSIGN(PageLoadHistograms);
 };
 
 #endif  // CHROME_RENDERER_PAGE_LOAD_HISTOGRAMS_H_