ui: Cleanup class/struct forward declarations

chrome/browser/ui/views/frame/native_browser_frame_factory_ozone.cc

Index: chrome/browser/ui/views/frame/native_browser_frame_factory_ozone.cc
diff --git a/chrome/browser/ui/views/frame/native_browser_frame_factory_chromeos.cc b/chrome/browser/ui/views/frame/native_browser_frame_factory_ozone.cc
similarity index 74%
copy from chrome/browser/ui/views/frame/native_browser_frame_factory_chromeos.cc
copy to chrome/browser/ui/views/frame/native_browser_frame_factory_ozone.cc
index c3f8a723cb115582b2fa7a0d40ed87a088f77411..09124dc6ed95a9dad0c9b47569d4549f5987b7a6 100644
--- a/chrome/browser/ui/views/frame/native_browser_frame_factory_chromeos.cc
+++ b/chrome/browser/ui/views/frame/native_browser_frame_factory_ozone.cc
@@ -1,10 +1,9 @@
-// Copyright 2013 The Chromium Authors. All rights reserved.
+// Copyright 2016 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/views/frame/native_browser_frame_factory.h"
 
-#include "chrome/browser/ui/views/frame/browser_frame_ash.h"
 #include "chrome/browser/ui/views/frame/browser_frame_mus.h"
 #include "services/service_manager/runner/common/client_util.h"
 
@@ -13,5 +12,7 @@ NativeBrowserFrame* NativeBrowserFrameFactory::Create(
     BrowserView* browser_view) {
   if (service_manager::ServiceManagerIsRemote())
     return new BrowserFrameMus(browser_frame, browser_view);
-  return new BrowserFrameAsh(browser_frame, browser_view);
+
+  NOTREACHED() << "For Ozone builds, only --mash launch is supported for now.";
+  return nullptr;
 }