components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/content_settings/host_content_settings_map.h

Index: chrome/browser/content_settings/host_content_settings_map.h
diff --git a/chrome/browser/content_settings/host_content_settings_map.h b/chrome/browser/content_settings/host_content_settings_map.h
index 28771dac93f065d9a21f959f237dca99c4369a55..b68e09d75188dcff4e7ff2f24a97f0e3ce28dd70 100644
--- a/chrome/browser/content_settings/host_content_settings_map.h
+++ b/chrome/browser/content_settings/host_content_settings_map.h
@@ -22,18 +22,21 @@
 #include "chrome/common/content_settings_pattern.h"
 #include "chrome/common/content_settings_types.h"
 
+class ExtensionService;
+class GURL;
+class PrefService;
+
 namespace base {
 class Value;
-}  // namespace base
+}
 
 namespace content_settings {
 class ProviderInterface;
-}  // namespace content_settings
+}
 
-class ExtensionService;
-class GURL;
-class PrefService;
+namespace user_prefs {
 class PrefRegistrySyncable;
+}
 
 class HostContentSettingsMap
     : public content_settings::Observer,
@@ -57,7 +60,7 @@ class HostContentSettingsMap
   void RegisterExtensionService(ExtensionService* extension_service);
 #endif
 
-  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
 
   // Returns the default setting for a particular content type. If |provider_id|
   // is not NULL, the id of the provider which provided the default setting is