don't display platform app resources in normal browser windows

chrome/browser/extensions/extension_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 
 #include <list>
 #include <map>
 #include <set>
@@ skipping 371 matching lines @@
   // Notifies Sync (if needed) of a newly-installed extension or a change to
   // an existing extension.
   virtual void SyncExtensionChangeIfNeeded(
       const extensions::Extension& extension) OVERRIDE;
 
   // Returns true if |url| should get extension api bindings and be permitted
   // to make api calls. Note that this is independent of what extension
   // permissions the given extension has been granted.
   bool ExtensionBindingsAllowed(const GURL& url);
 
+  // Returns true if a normal browser window should avoid showing |url| in a
+  // tab. In this case, |url| is also rewritten to an error URL.
+  bool ShouldBlockUrlInBrowserTab(GURL* url);
+
   // Returns the icon to display in the omnibox for the given extension.
   gfx::Image GetOmniboxIcon(const std::string& extension_id);
 
   // Returns the icon to display in the omnibox popup window for the given
   // extension.
   gfx::Image GetOmniboxPopupIcon(const std::string& extension_id);
 
   // Called when the initial extensions load has completed.
   virtual void OnLoadedInstalledExtensions();
 
@@ skipping 491 matching lines @@
 #endif
 
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsWithUnlimtedStorage);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsAndCheckStorageProtection);
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_