Don't use browser windows for platform app shell windows

chrome/browser/extensions/extension_process_manager.h

Index: chrome/browser/extensions/extension_process_manager.h
diff --git a/chrome/browser/extensions/extension_process_manager.h b/chrome/browser/extensions/extension_process_manager.h
index 655385803ade323bfa4d73aab6a8fd41490257f7..246f2d2684aeb58079e03878dd1c8d82a7eb5ffb 100644
--- a/chrome/browser/extensions/extension_process_manager.h
+++ b/chrome/browser/extensions/extension_process_manager.h
@@ -33,6 +33,8 @@ class ExtensionProcessManager : public content::NotificationObserver {
   static ExtensionProcessManager* Create(Profile* profile);
   virtual ~ExtensionProcessManager();
 
+  ExtensionHost* CreateShellHost(const Extension* extension, const GURL& url);
+
   // Creates a new ExtensionHost with its associated view, grouping it in the
   // appropriate SiteInstance (and therefore process) based on the URL and
   // profile.
@@ -54,6 +56,8 @@ class ExtensionProcessManager : public content::NotificationObserver {
   ExtensionHost* CreateInfobarHost(const GURL& url,
                                    Browser* browser);
 
+  ExtensionHost* CreateShellHost(const GURL& url, Browser* browser);
+
   // Open the extension's options page.
   void OpenOptionsPage(const Extension* extension, Browser* browser);