components: Move PrefRegistrySyncable into user_prefs namespace.

components/autofill/browser/autofill_manager.h

Index: components/autofill/browser/autofill_manager.h
diff --git a/components/autofill/browser/autofill_manager.h b/components/autofill/browser/autofill_manager.h
index 9fd261b8386a4b72bc322cd5d3f986252e5f6b66..5a2b083193c4fc9ce6051d66094785cf45cba7d2 100644
--- a/components/autofill/browser/autofill_manager.h
+++ b/components/autofill/browser/autofill_manager.h
@@ -35,7 +35,6 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFormElement.h"
 
 class GURL;
-class PrefRegistrySyncable;
 
 struct ViewHostMsg_FrameNavigate_Params;
 
@@ -53,6 +52,10 @@ namespace IPC {
 class Message;
 }
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 namespace autofill {
 
 class AutofillDataModel;
@@ -82,7 +85,7 @@ class AutofillManager : public content::WebContentsObserver,
   static AutofillManager* FromWebContents(content::WebContents* contents);
 
   // Registers our Enable/Disable Autofill pref.
-  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
 
   // Set an external delegate.
   void SetExternalDelegate(AutofillExternalDelegate* delegate);