Don't use browser windows for platform app shell windows

chrome/browser/extensions/extension_host.h

Index: chrome/browser/extensions/extension_host.h
diff --git a/chrome/browser/extensions/extension_host.h b/chrome/browser/extensions/extension_host.h
index 6c73751b05fb6bf98021b026eb9c184ec14a7cf5..78945dcb4ee4560572ebcdd173941477b95fcaaf 100644
--- a/chrome/browser/extensions/extension_host.h
+++ b/chrome/browser/extensions/extension_host.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -71,6 +71,9 @@ class ExtensionHost : public content::WebContentsDelegate,
   // instantiate Browser objects.
   void CreateView(Browser* browser);
 
+  // Helper variant of the above for cases where no Browser is present.
+  void CreateViewWithoutBrowser();
+
   const Extension* extension() const { return extension_; }
   const std::string& extension_id() const { return extension_id_; }
   content::WebContents* host_contents() const { return host_contents_.get(); }