Move Extension into extensions namespace

chrome/browser/ui/views/extensions/extension_keybinding_registry_views.h

Index: chrome/browser/ui/views/extensions/extension_keybinding_registry_views.h
diff --git a/chrome/browser/ui/views/extensions/extension_keybinding_registry_views.h b/chrome/browser/ui/views/extensions/extension_keybinding_registry_views.h
index f6758085c2bdfbfc4d936496737337c8d7d9550e..2e8351962fc902e2737c4da2ff134bf3ba41c6a4 100644
--- a/chrome/browser/ui/views/extensions/extension_keybinding_registry_views.h
+++ b/chrome/browser/ui/views/extensions/extension_keybinding_registry_views.h
@@ -13,9 +13,12 @@
 #include "chrome/browser/extensions/extension_keybinding_registry.h"
 #include "ui/base/accelerators/accelerator.h"
 
-class Extension;
 class Profile;
 
+namespace extensions {
+class Extension;
+}
+
 namespace views {
 class FocusManager;
 }
@@ -40,8 +43,10 @@ class ExtensionKeybindingRegistryViews
 
  private:
   // Overridden from ExtensionKeybindingRegistry:
-  virtual void AddExtensionKeybinding(const Extension* extension) OVERRIDE;
-  virtual void RemoveExtensionKeybinding(const Extension* extension) OVERRIDE;
+  virtual void AddExtensionKeybinding(
+      const extensions::Extension* extension) OVERRIDE;
+  virtual void RemoveExtensionKeybinding(
+      const extensions::Extension* extension) OVERRIDE;
 
   // Weak pointer to the our profile. Not owned by us.
   Profile* profile_;