Move Extension into extensions namespace

chrome/browser/extensions/extension_infobar_delegate.h

Index: chrome/browser/extensions/extension_infobar_delegate.h
diff --git a/chrome/browser/extensions/extension_infobar_delegate.h b/chrome/browser/extensions/extension_infobar_delegate.h
index 0e230e130739f402cd863fc01fc9a60f88640b0c..a8205bd8c234e09b1878aa580a1eeb2c55a5ef3a 100644
--- a/chrome/browser/extensions/extension_infobar_delegate.h
+++ b/chrome/browser/extensions/extension_infobar_delegate.h
@@ -12,10 +12,13 @@
 #include "content/public/browser/notification_registrar.h"
 
 class Browser;
-class Extension;
 class ExtensionHost;
 class GURL;
 
+namespace extensions {
+class Extension;
+}
+
 // The InfobarDelegate for creating and managing state for the ExtensionInfobar
 // plus monitor when the extension goes away.
 class ExtensionInfoBarDelegate : public InfoBarDelegate,
@@ -32,11 +35,11 @@ class ExtensionInfoBarDelegate : public InfoBarDelegate,
 
   ExtensionInfoBarDelegate(Browser* browser,
                            InfoBarTabHelper* infobar_helper,
-                           const Extension* extension,
+                           const extensions::Extension* extension,
                            const GURL& url,
                            int height);
 
-  const Extension* extension() { return extension_; }
+  const extensions::Extension* extension() { return extension_; }
   ExtensionHost* extension_host() { return extension_host_.get(); }
   int height() { return height_; }
 
@@ -70,7 +73,7 @@ class ExtensionInfoBarDelegate : public InfoBarDelegate,
   // The observer monitoring when the delegate dies.
   DelegateObserver* observer_;
 
-  const Extension* extension_;
+  const extensions::Extension* extension_;
   content::NotificationRegistrar registrar_;
 
   // The requested height of the infobar (in pixels).