Move Extension into extensions namespace

chrome/browser/ui/gtk/extensions/extension_installed_bubble_gtk.h

Index: chrome/browser/ui/gtk/extensions/extension_installed_bubble_gtk.h
diff --git a/chrome/browser/ui/gtk/extensions/extension_installed_bubble_gtk.h b/chrome/browser/ui/gtk/extensions/extension_installed_bubble_gtk.h
index cf217232a3e7add53861e1c4bb49dd8839c5738e..54f9d060b9d48d928565e9c1d31e9f09bf9b87d9 100644
--- a/chrome/browser/ui/gtk/extensions/extension_installed_bubble_gtk.h
+++ b/chrome/browser/ui/gtk/extensions/extension_installed_bubble_gtk.h
@@ -16,9 +16,12 @@
 #include "third_party/skia/include/core/SkBitmap.h"
 
 class Browser;
-class Extension;
 class SkBitmap;
 
+namespace extensions {
+class Extension;
+}
+
 // Provides feedback to the user upon successful installation of an
 // extension. Depending on the type of extension, the BubbleGtk will
 // point to:
@@ -47,14 +50,16 @@ class ExtensionInstalledBubbleGtk
   // the extension has loaded. |extension| is the installed extension. |browser|
   // is the browser window which will host the bubble. |icon| is the install
   // icon of the extension.
-  static void Show(
-      const Extension* extension, Browser *browser, const SkBitmap& icon);
+  static void Show(const extensions::Extension* extension,
+                   Browser *browser,
+                   const SkBitmap& icon);
 
  private:
   friend class base::RefCountedThreadSafe<ExtensionInstalledBubbleGtk>;
 
   // Private ctor. Registers a listener for EXTENSION_LOADED.
-  ExtensionInstalledBubbleGtk(const Extension* extension, Browser *browser,
+  ExtensionInstalledBubbleGtk(const extensions::Extension* extension,
+                              Browser *browser,
                               const SkBitmap& icon);
 
   virtual ~ExtensionInstalledBubbleGtk();
@@ -76,7 +81,7 @@ class ExtensionInstalledBubbleGtk
   static void OnButtonClick(GtkWidget* button,
                             ExtensionInstalledBubbleGtk* toolbar);
 
-  const Extension* extension_;
+  const extensions::Extension* extension_;
   Browser* browser_;
   SkBitmap icon_;
   content::NotificationRegistrar registrar_;