Move Extension into extensions namespace

chrome/browser/extensions/extension_menu_manager.h

Index: chrome/browser/extensions/extension_menu_manager.h
diff --git a/chrome/browser/extensions/extension_menu_manager.h b/chrome/browser/extensions/extension_menu_manager.h
index 299fa059edc0e232d44a706095bfea391824e303..14c2bdf608f0c8b275fded9a4d5d65d1a79564dd 100644
--- a/chrome/browser/extensions/extension_menu_manager.h
+++ b/chrome/browser/extensions/extension_menu_manager.h
@@ -22,7 +22,6 @@
 #include "content/public/browser/notification_registrar.h"
 
 
-class Extension;
 class Profile;
 class SkBitmap;
 
@@ -31,6 +30,10 @@ class WebContents;
 struct ContextMenuParams;
 }
 
+namespace extensions {
+class Extension;
+}
+
 // Represents a menu item added by an extension.
 class ExtensionMenuItem {
  public:
@@ -219,7 +222,8 @@ class ExtensionMenuManager : public content::NotificationObserver {
   // Adds a top-level menu item for an extension, requiring the |extension|
   // pointer so it can load the icon for the extension. Takes ownership of
   // |item|. Returns a boolean indicating success or failure.
-  bool AddContextItem(const Extension* extension, ExtensionMenuItem* item);
+  bool AddContextItem(const extensions::Extension* extension,
+                      ExtensionMenuItem* item);
 
   // Add an item as a child of another item which has been previously added, and
   // takes ownership of |item|. Returns a boolean indicating success or failure.