ui + mus: Split ContextFactory into ContextFactory(Client) and ContextFactoryPrivate

content/public/browser/context_factory.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_CONTEXT_FACTORY_H_
 #define CONTENT_PUBLIC_BROWSER_CONTEXT_FACTORY_H_
 
 #include "content/common/content_export.h"
 
 namespace ui {
 class ContextFactory;
+class ContextFactoryPrivate;
 }
 
 namespace content {
 
 // Returns the singleton ContextFactory used by content. The return value is
 // owned by content.
 CONTENT_EXPORT ui::ContextFactory* GetContextFactory();
 
+// Returns the singleton ContextFactoryPrivate used by content. The return value
+// is owned by content.
+// TODO(fsamuel): Once Mus is used on all platforms, this private interface
+// should not be necessary.
+CONTENT_EXPORT ui::ContextFactoryPrivate* GetContextFactoryPrivate();
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CONTEXT_FACTORY_H_