Disable modal JavaScript dialogs for platform apps.

chrome/browser/extensions/extension_host.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_host.h"
 
 #include <list>
 
 #include "base/bind.h"
 #include "base/memory/singleton.h"
@@ skipping 382 matching lines @@
       extension_host_type_ == chrome::VIEW_TYPE_EXTENSION_BACKGROUND_PAGE ||
       extension_host_type_ == chrome::VIEW_TYPE_EXTENSION_INFOBAR ||
       extension_host_type_ == chrome::VIEW_TYPE_APP_SHELL) {
     content::NotificationService::current()->Notify(
         chrome::NOTIFICATION_EXTENSION_HOST_VIEW_SHOULD_CLOSE,
         content::Source<Profile>(profile_),
         content::Details<ExtensionHost>(this));
   }
 }
 
+bool ExtensionHost::ShouldSuppressDialogs() {
+  return extension_->is_platform_app();
+}
+
 WebContents* ExtensionHost::OpenURLFromTab(WebContents* source,
                                            const OpenURLParams& params) {
   // Whitelist the dispositions we will allow to be opened.
   switch (params.disposition) {
     case SINGLETON_TAB:
     case NEW_FOREGROUND_TAB:
     case NEW_BACKGROUND_TAB:
     case NEW_POPUP:
     case NEW_WINDOW:
     case SAVE_TO_DISK:
@@ skipping 135 matching lines @@
   browser::Navigate(&params);
 }
 
 
 void ExtensionHost::RenderViewReady() {
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_EXTENSION_HOST_CREATED,
       content::Source<Profile>(profile_),
       content::Details<ExtensionHost>(this));
 }