Move Extension into extensions namespace

chrome/browser/extensions/user_script_listener.h

Index: chrome/browser/extensions/user_script_listener.h
diff --git a/chrome/browser/extensions/user_script_listener.h b/chrome/browser/extensions/user_script_listener.h
index 15797bd4e15deaca8bea24bf2bbef30199784b11..163b555a64731d6e9e6a3f5672dcecd8e9c35b58 100644
--- a/chrome/browser/extensions/user_script_listener.h
+++ b/chrome/browser/extensions/user_script_listener.h
@@ -18,7 +18,6 @@
 #include "content/public/browser/notification_registrar.h"
 #include "webkit/glue/resource_type.h"
 
-class Extension;
 class GURL;
 class URLPattern;
 
@@ -26,6 +25,10 @@ namespace content {
 class ResourceThrottle;
 }
 
+namespace extensions {
+class Extension;
+}
+
 // This class handles delaying of resource loads that depend on unloaded user
 // scripts. For each request that comes in, we check if it depends on a user
 // script, and if so, whether that user script is ready; if not, we delay the
@@ -95,7 +98,8 @@ class UserScriptListener
 
   // Helper to collect the extension's user script URL patterns in a list and
   // return it.
-  void CollectURLPatterns(const Extension* extension, URLPatterns* patterns);
+  void CollectURLPatterns(const extensions::Extension* extension,
+                          URLPatterns* patterns);
 
   // content::NotificationObserver
   virtual void Observe(int type,