components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/ui/gesture_prefs_observer_factory_aura.h

Index: chrome/browser/ui/gesture_prefs_observer_factory_aura.h
diff --git a/chrome/browser/ui/gesture_prefs_observer_factory_aura.h b/chrome/browser/ui/gesture_prefs_observer_factory_aura.h
index f1509008a4101cb11a7852d8f75ba516159cb733..9f2cbf4e411eb707493a75b2da712dab48266b91 100644
--- a/chrome/browser/ui/gesture_prefs_observer_factory_aura.h
+++ b/chrome/browser/ui/gesture_prefs_observer_factory_aura.h
@@ -9,7 +9,6 @@
 #include "base/memory/singleton.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
-class PrefRegistrySyncable;
 class PrefService;
 class Profile;
 
@@ -24,14 +23,15 @@ class GesturePrefsObserverFactoryAura : public ProfileKeyedServiceFactory {
   GesturePrefsObserverFactoryAura();
   virtual ~GesturePrefsObserverFactoryAura();
 
-  void RegisterOverscrollPrefs(PrefRegistrySyncable* registry);
-  void RegisterFlingCurveParameters(PrefRegistrySyncable* registry);
-  void RegisterWorkspaceCyclerPrefs(PrefRegistrySyncable* registry);
+  void RegisterOverscrollPrefs(user_prefs::PrefRegistrySyncable* registry);
+  void RegisterFlingCurveParameters(user_prefs::PrefRegistrySyncable* registry);
+  void RegisterWorkspaceCyclerPrefs(user_prefs::PrefRegistrySyncable* registry);
 
   // ProfileKeyedServiceFactory:
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const OVERRIDE;
-  virtual void RegisterUserPrefs(PrefRegistrySyncable* registry) OVERRIDE;
+  virtual void RegisterUserPrefs(
+      user_prefs::PrefRegistrySyncable* registry) OVERRIDE;
   virtual bool ServiceIsCreatedWithProfile() const OVERRIDE;
   virtual content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const OVERRIDE;