components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/renderer_host/pepper/device_id_fetcher.h

 // Copyright (c) 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_BROWSER_RENDERER_HOST_PEPPER_DEVICE_ID_FETCHER_H_
 #define CHROME_BROWSER_RENDERER_HOST_PEPPER_DEVICE_ID_FETCHER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "ppapi/c/pp_instance.h"
 
-class PrefRegistrySyncable;
 class Profile;
 
 namespace content {
 class BrowserPpapiHost;
 }
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 namespace chrome {
 
 class PepperFlashDeviceIDHost;
 
 // This class allows asynchronously fetching a unique device ID. The callback
 // passed in on creation will be called when the ID has been fetched.
 class DeviceIDFetcher : public base::RefCountedThreadSafe<DeviceIDFetcher> {
  public:
   typedef base::Callback<void(const std::string&)> IDCallback;
 
   explicit DeviceIDFetcher(const IDCallback& callback, PP_Instance instance);
 
   // Schedules the request operation.
   void Start(content::BrowserPpapiHost* browser_host);
 
   // Called to register the |kEnableDRM| and |kDRMSalt| preferences.
-  static void RegisterUserPrefs(PrefRegistrySyncable* prefs);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* prefs);
 
   // Return the path where the legacy device ID is stored (for ChromeOS only).
   static base::FilePath GetLegacyDeviceIDPath(
       const base::FilePath& profile_path);
 
  private:
   ~DeviceIDFetcher();
 
   // Checks the preferences for DRM (whether DRM is enabled and getting the drm
   // salt) on the UI thread. These are passed to |ComputeOnIOThread|.
@@ skipping 19 matching lines @@
   IDCallback callback_;
 
   PP_Instance instance_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceIDFetcher);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_PEPPER_DEVICE_ID_FETCHER_H_