Restrict app sandbox's CSP to disallow loading web content in them.

chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc

 // Copyright 2014 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/chrome_content_browser_client_extensions_part.h"
 
 #include <stddef.h>
 
 #include <set>
 
@@ skipping 287 matching lines @@
   if (IsIsolateExtensionsEnabled()) {
     const Extension* extension =
         ExtensionRegistry::Get(browser_context)
             ->enabled_extensions()
             .GetExtensionOrAppByURL(effective_site_url);
     if (extension) {
       // Always isolate Chrome Web Store.
       if (extension->id() == kWebStoreAppId)
         return true;
 
-      // --isolate-extensions should isolate extensions, except for a) hosted
-      // apps, b) platform apps.
-      // a) Isolating hosted apps is a good idea, but ought to be a separate
-      //    knob.
-      // b) Sandbox pages in platform app can load web content in iframes;
-      //    isolating the app and the iframe leads to StoragePartition mismatch
-      //    in the two processes.
-      //    TODO(lazyboy): We should deprecate this behaviour and not let web
-      //    content load in platform app's process; see http://crbug.com/615585.
-      if (extension->is_hosted_app() || extension->is_platform_app())
+      // --isolate-extensions should isolate extensions, except for hosted
+      // apps. Isolating hosted apps is a good idea, but ought to be a separate
+      // knob.
+      if (extension->is_hosted_app())
         return false;
 
       // Isolate all extensions.
       return true;
     }
   }
   return false;
 }
 
 // static
@@ skipping 470 matching lines @@
     command_line->AppendSwitch(switches::kExtensionProcess);
   }
 }
 
 void ChromeContentBrowserClientExtensionsPart::ResourceDispatcherHostCreated() {
   content::ResourceDispatcherHost::Get()->RegisterInterceptor(
       "Origin", kExtensionScheme, base::Bind(&OnHttpHeaderReceived));
 }
 
 }  // namespace extensions