Removes explicit shutdown of TabRestoreService in ~Browser

chrome/browser/ui/browser.cc

 // Copyright 2012 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.
 
 #include "chrome/browser/ui/browser.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 505 matching lines @@
   SessionService* session_service =
       SessionServiceFactory::GetForProfile(profile_);
   if (session_service)
     session_service->WindowClosed(session_id_);
 
   sessions::TabRestoreService* tab_restore_service =
       TabRestoreServiceFactory::GetForProfile(profile());
   if (tab_restore_service)
     tab_restore_service->BrowserClosed(live_tab_context());
 
-#if !defined(OS_MACOSX)
-  if (!chrome::GetBrowserCount(profile_)) {
-    // We're the last browser window with this profile. We need to nuke the
-    // TabRestoreService, which will start the shutdown of the
-    // NavigationControllers and allow for proper shutdown. If we don't do this
-    // chrome won't shutdown cleanly, and may end up crashing when some
-    // thread tries to use the IO thread (or another thread) that is no longer
-    // valid.
-    // This isn't a valid assumption for Mac OS, as it stays running after
-    // the last browser has closed. The Mac equivalent is in its app
-    // controller.
-    TabRestoreServiceFactory::ResetForProfile(profile_);
-  }
-#endif
-
   profile_pref_registrar_.RemoveAll();
 
   encoding_auto_detect_.Destroy();
 
   // Destroy BrowserExtensionWindowController before the incognito profile
   // is destroyed to make sure the chrome.windows.onRemoved event is sent.
   extension_window_controller_.reset();
 
   // Destroy BrowserInstantController before the incongnito profile is destroyed
   // because the InstantController destructor depends on this profile.
@@ skipping 2203 matching lines @@
   if (contents && !allow_js_access) {
     contents->web_contents()->GetController().LoadURL(
         target_url,
         content::Referrer(),
         ui::PAGE_TRANSITION_LINK,
         std::string());  // No extra headers.
   }
 
   return contents != NULL;
 }