Move ExtensionHost into extensions namespace

chrome/browser/extensions/extension_infobar_delegate.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/extension_infobar_delegate.h"
 
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/infobars/infobar.h"
 #include "chrome/browser/infobars/infobar_tab_helper.h"
@@ skipping 74 matching lines @@
 ExtensionInfoBarDelegate*
     ExtensionInfoBarDelegate::AsExtensionInfoBarDelegate() {
   return this;
 }
 
 void ExtensionInfoBarDelegate::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   if (type == chrome::NOTIFICATION_EXTENSION_HOST_VIEW_SHOULD_CLOSE) {
-    if (extension_host_.get() == content::Details<ExtensionHost>(details).ptr())
+    if (extension_host_.get() ==
+        content::Details<extensions::ExtensionHost>(details).ptr())
       RemoveSelf();
   } else {
     DCHECK(type == chrome::NOTIFICATION_EXTENSION_UNLOADED);
     if (extension_ ==
         content::Details<extensions::UnloadedExtensionInfo>(
             details)->extension) {
       RemoveSelf();
     }
   }
 }