Move UserScript and related 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 0ec458513a570ee0423503df16afb396bc42f49b..d4f6c4a77878d948a8d019396c863000af003f2d 100644
--- a/chrome/browser/extensions/user_script_listener.h
+++ b/chrome/browser/extensions/user_script_listener.h
@@ -26,7 +26,6 @@ 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
@@ -97,7 +96,7 @@ class UserScriptListener
 
   // Helper to collect the extension's user script URL patterns in a list and
   // return it.
-  void CollectURLPatterns(const extensions::Extension* extension,
+  void CollectURLPatterns(const Extension* extension,
                           URLPatterns* patterns);
 
   // content::NotificationObserver
@@ -110,4 +109,6 @@ class UserScriptListener
   DISALLOW_COPY_AND_ASSIGN(UserScriptListener);
 };
 
+}  // namespace extensions
+
 #endif  // CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_LISTENER_H_