components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/pepper_flash_settings_manager.h

Index: chrome/browser/pepper_flash_settings_manager.h
diff --git a/chrome/browser/pepper_flash_settings_manager.h b/chrome/browser/pepper_flash_settings_manager.h
index 8649bff8321f5572742b263ca3655d7edd7f97fa..3956ac3d53f717cac081c4cce1d528614f1ee572 100644
--- a/chrome/browser/pepper_flash_settings_manager.h
+++ b/chrome/browser/pepper_flash_settings_manager.h
@@ -12,13 +12,16 @@
 #include "ppapi/shared_impl/ppp_flash_browser_operations_shared.h"
 
 class PluginPrefs;
-class PrefRegistrySyncable;
 class PrefService;
 
 namespace content {
 class BrowserContext;
 }
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 namespace webkit {
 struct WebPluginInfo;
 }
@@ -63,7 +66,7 @@ class PepperFlashSettingsManager {
   static bool IsPepperFlashInUse(PluginPrefs* plugin_prefs,
                                  webkit::WebPluginInfo* plugin_info);
 
-  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
 
   // Requests to deauthorize content licenses.
   // Client::OnDeauthorizeContentLicensesCompleted() will be called when the