Cleanup VersionInfo after componentization.

chrome/common/extensions/features/feature_channel.h

 // Copyright 2013 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 CHROME_COMMON_EXTENSIONS_FEATURES_FEATURE_CHANNEL_H_
 #define CHROME_COMMON_EXTENSIONS_FEATURES_FEATURE_CHANNEL_H_
 
-#include "chrome/common/chrome_version_info.h"
+#include "base/macros.h"
+
+namespace version_info {
+enum class Channel;
+}
 
 namespace extensions {
 
 // Gets the current channel as seen by the Feature system.
 version_info::Channel GetCurrentChannel();
 
 // Sets the current channel as seen by the Feature system. In the browser
-// process this should be chrome::VersionInfo::GetChannel(), and in the
-// renderer this will need to come from an IPC.
+// process this should be chrome::GetChannel(), and in the renderer this will
+// need to come from an IPC.
 void SetCurrentChannel(version_info::Channel channel);
 
 // Gets the default channel as seen by the Feature system.
 version_info::Channel GetDefaultChannel();
 
 // Scoped channel setter. Use for tests.
 class ScopedCurrentChannel {
  public:
   explicit ScopedCurrentChannel(version_info::Channel channel);
   ~ScopedCurrentChannel();
 
  private:
   version_info::Channel original_channel_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedCurrentChannel);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_FEATURES_FEATURE_CHANNEL_H_