Make nesting/running states a RunLoop rather than a MessageLoop concept.

chrome/browser/app_controller_mac.mm

 // Copyright (c) 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.
 
 #import "chrome/browser/app_controller_mac.h"
 
 #include <stddef.h>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 928 matching lines @@
     if ([delegate respondsToSelector:@selector(commandDispatch:)]) {
       [delegate commandDispatch:sender];
       return;
     }
   }
 
   // Ignore commands during session restore's browser creation.  It uses a
   // nested message loop and commands dispatched during this operation cause
   // havoc.
   if (SessionRestore::IsRestoring(lastProfile) &&
-      base::MessageLoop::current()->IsNested())
+      base::RunLoop::IsNestedOnCurrentThread()) {
     return;
+  }
 
   NSInteger tag = [sender tag];
 
   // If there are no browser windows, and we are trying to open a browser
   // for a locked profile or the system profile, we have to show the User
   // Manager instead as the locked profile needs authentication and the system
   // profile cannot have a browser.
   if (IsProfileSignedOut(lastProfile) || lastProfile->IsSystemProfile()) {
     UserManager::Show(base::FilePath(),
                       profiles::USER_MANAGER_NO_TUTORIAL,
@@ skipping 647 matching lines @@
 
 //---------------------------------------------------------------------------
 
 namespace app_controller_mac {
 
 bool IsOpeningNewWindow() {
   return g_is_opening_new_window;
 }
 
 }  // namespace app_controller_mac