[Cleanup] No wchar_t for Cocoa.

chrome/browser/ui/cocoa/extensions/extension_action_platform_delegate_cocoa.mm

 // Copyright 2014 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/ui/cocoa/extensions/extension_action_platform_delegate_cocoa.h"
 
 #include <string>
 #include <utility>
 
 #include "base/logging.h"
@@ skipping 133 matching lines @@
       gfx::NativeWindow window = payload->second;
       if (window == controller_->browser()->window()->GetNativeWindow() &&
           extension_id == controller_->extension()->id() &&
           controller_->IsEnabled(
               controller_->view_delegate()->GetCurrentWebContents())) {
         controller_->ExecuteAction(true);
       }
       break;
     }
     default:
-      NOTREACHED() << L"Unexpected notification";
+      NOTREACHED() << "Unexpected notification";
   }
 }