Componentize proxy code from chrome/browser/net

components/proxy_config/pref_proxy_config_tracker.h

 // Copyright (c) 2011 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_BROWSER_NET_PREF_PROXY_CONFIG_TRACKER_H_
-#define CHROME_BROWSER_NET_PREF_PROXY_CONFIG_TRACKER_H_
+#ifndef COMPONENTS_PROXY_CONFIG_PREF_PROXY_CONFIG_TRACKER_H_
+#define COMPONENTS_PROXY_CONFIG_PREF_PROXY_CONFIG_TRACKER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace net {
 class ProxyConfigService;
 }
 
 // Interface for a class that tracks proxy preferences. The purpose of the
 // concrete class is to track changes in the Preferences, to translates the
@@ skipping 16 matching lines @@
 
   // Releases the PrefService passed upon construction and the |base_service|
   // passed to CreateTrackingProxyConfigService. This must be called on the UI
   // thread.
   virtual void DetachFromPrefService() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PrefProxyConfigTracker);
 };
 
-#endif  // CHROME_BROWSER_NET_PREF_PROXY_CONFIG_TRACKER_H_
+#endif  // COMPONENTS_PROXY_CONFIG_PREF_PROXY_CONFIG_TRACKER_H_