Add histogram for how tab closing time. Did some cleanup along the way.

chrome/browser/tab_contents/render_view_host_manager.h

 // Copyright (c) 2009 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_BROWSER_TAB_CONTENTS_RENDER_VIEW_HOST_MANAGER_H_
 #define CHROME_BROWSER_TAB_CONTENTS_RENDER_VIEW_HOST_MANAGER_H_
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
 #include "chrome/browser/renderer_host/render_view_host.h"
@@ skipping 116 matching lines @@
   void DidNavigateMainFrame(RenderViewHost* render_view_host);
 
   // Set the DOMUI after committing a page load. This is useful for navigations
   // initiated from a renderer, where we want to give the new renderer DOMUI
   // privileges from the originating renderer.
   void SetDOMUIPostCommit(DOMUI* dom_ui);
 
   // Called when a provisional load on the given renderer is aborted.
   void RendererAbortedProvisionalLoad(RenderViewHost* render_view_host);
 
-  // Forwards the message to the RenderViewHost, which is the original one.
-  void OnJavaScriptMessageBoxClosed(IPC::Message* reply_msg,
-                                    bool success,
-                                    const std::wstring& prompt);
-
   // Sets the passed passed interstitial as the currently showing interstitial.
   // |interstitial_page| should be non NULL (use the remove_interstitial_page
   // method to unset the interstitial) and no interstitial page should be set
   // when there is already a non NULL interstitial page set.
   void set_interstitial_page(InterstitialPage* interstitial_page) {
     DCHECK(!interstitial_page_ && interstitial_page);
     interstitial_page_ = interstitial_page;
   }
 
   // Unsets the currently showing interstitial.
@@ skipping 92 matching lines @@
 };
 
 // The "details" for a NOTIFY_RENDER_VIEW_HOST_CHANGED notification. The old
 // host can be NULL when the first RenderViewHost is set.
 struct RenderViewHostSwitchedDetails {
   RenderViewHost* old_host;
   RenderViewHost* new_host;
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_RENDER_VIEW_HOST_MANAGER_H_