Move histograms and supporting code that don't belong in content out.

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index e9efe2d868b391f8f46dc556064c0d586dedebd3..db1f4454875c343638d3aa357183ccd6f99729f3 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -264,10 +264,7 @@ class CONTENT_EXPORT WebContentsImpl
   virtual void SetOverrideEncoding(const std::string& encoding) OVERRIDE;
   virtual void ResetOverrideEncoding() OVERRIDE;
   virtual RendererPreferences* GetMutableRendererPrefs() OVERRIDE;
-  virtual void SetNewTabStartTime(const base::TimeTicks& time) OVERRIDE;
-  virtual base::TimeTicks GetNewTabStartTime() const OVERRIDE;
   virtual void Close() OVERRIDE;
-  virtual void OnCloseStarted() OVERRIDE;
   virtual void SystemDragEnded() OVERRIDE;
   virtual void UserGestureDone() OVERRIDE;
   virtual void SetClosedByUserGesture(bool value) OVERRIDE;
@@ -866,15 +863,6 @@ class CONTENT_EXPORT WebContentsImpl
   // Settings that get passed to the renderer process.
   RendererPreferences renderer_preferences_;
 
-  // The time that we started to create the new tab page.
-  base::TimeTicks new_tab_start_time_;
-
-  // The time that we started to close this WebContents.
-  base::TimeTicks close_start_time_;
-
-  // The time when onbeforeunload ended.
-  base::TimeTicks before_unload_end_time_;
-
   // The time that this tab was last selected.
   base::TimeTicks last_selected_time_;