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"
+#include "components/proxy_config/proxy_config_export.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
 // preferences to net::ProxyConfig and to push the result over to a
 // net::ProxyConfigService onto the IO thread.
-class PrefProxyConfigTracker {
+class PROXY_CONFIG_EXPORT PrefProxyConfigTracker {
  public:
   PrefProxyConfigTracker();
   virtual ~PrefProxyConfigTracker();
 
   // Creates a net::ProxyConfigService and keeps a pointer to it. After this
   // call, this tracker forwards any changes of proxy preferences to the created
   // ProxyConfigService. The returned ProxyConfigService must not be deleted
   // before DetachFromPrefService was called. Takes ownership of the passed
   // |base_service|, which can be NULL. This |base_service| provides the proxy
   // settings of the OS (except of ChromeOS). This must be called on the
   // UI thread.
   virtual scoped_ptr<net::ProxyConfigService> CreateTrackingProxyConfigService(
       scoped_ptr<net::ProxyConfigService> base_service) = 0;
 
   // 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_