Disable synchronous XMLHttpRequests in platform app documents.

webkit/glue/webpreferences.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.
 //
 // A struct for managing webkit's settings.
 //
 // Adding new values to this class probably involves updating
-// WebKit::WebSettings, common/render_messages.cc, browser/tab_contents/
+// WebKit::WebSettings, content/common/view_messages.h, browser/tab_contents/
 // render_view_host_delegate_helper.cc, and browser/profiles/profile.cc.
 
 #ifndef WEBKIT_GLUE_WEBPREFERENCES_H__
 #define WEBKIT_GLUE_WEBPREFERENCES_H__
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/string16.h"
@@ skipping 102 matching lines @@
   bool hixie76_websocket_protocol_enabled;
   bool visual_word_movement_enabled;
   bool per_tile_painting_enabled;
   bool css_regions_enabled;
   bool css_shaders_enabled;
   int default_tile_width;
   int default_tile_height;
   int max_untiled_layer_width;
   int max_untiled_layer_height;
   bool fixed_position_creates_stacking_context;
+  bool sync_xhr_in_documents_enabled;
 
   // We try to keep the default values the same as the default values in
   // chrome, except for the cases where it would require lots of extra work for
   // the embedder to use the same default value.
   WebPreferences();
   ~WebPreferences();
 
   void Apply(WebKit::WebView* web_view) const;
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_GLUE_WEBPREFERENCES_H__