components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/ui/webui/ntp/suggestions_page_handler.h

Index: chrome/browser/ui/webui/ntp/suggestions_page_handler.h
diff --git a/chrome/browser/ui/webui/ntp/suggestions_page_handler.h b/chrome/browser/ui/webui/ntp/suggestions_page_handler.h
index 5dbaaa74a88da3bcddbeac36953efeaf38e6f151..8b5a2437969ab869a8a68ffaf94c128dd5b56937 100644
--- a/chrome/browser/ui/webui/ntp/suggestions_page_handler.h
+++ b/chrome/browser/ui/webui/ntp/suggestions_page_handler.h
@@ -16,13 +16,16 @@
 
 class GURL;
 class PageUsageData;
-class PrefRegistrySyncable;
 
 namespace base {
 class ListValue;
 class Value;
 }
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 // The handler for Javascript messages related to the "suggestions" view.
 //
 // This class manages one preference:
@@ -65,7 +68,7 @@ class SuggestionsHandler : public content::WebUIMessageHandler,
   // SuggestionsCombiner::Delegate implementation.
   virtual void OnSuggestionsReady() OVERRIDE;
 
-  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
 
  private:
   // Puts the passed URL in the blacklist (so it does not show as a thumbnail).