Delete "Experimental WebSocket" flag from chrome://flags.

webkit/common/webpreferences.h

 // Copyright 2013 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
 // blink::WebSettings, content/common/view_messages.h, browser/tab_contents/
 // render_view_host_delegate_helper.cc, and browser/profiles/profile.cc.
 
@@ skipping 132 matching lines @@
   bool should_respect_image_orientation;
   int number_of_cpu_cores;
   webkit_glue::EditingBehavior editing_behavior;
   bool supports_multiple_windows;
   bool viewport_enabled;
   bool viewport_meta_enabled;
   bool main_frame_resizes_are_orientation_changes;
   bool initialize_at_minimum_page_scale;
   bool smart_insert_delete_enabled;
   bool spatial_navigation_enabled;
-  bool experimental_websocket_enabled;
   bool pinch_virtual_viewport_enabled;
   int pinch_overlay_scrollbar_thickness;
   bool use_solid_color_scrollbars;
   bool compositor_touch_hit_testing;
   bool navigate_on_drag_drop;
 
   // This flags corresponds to a Page's Settings' setCookieEnabled state. It
   // only controls whether or not the "document.cookie" field is properly
   // connected to the backing store, for instance if you wanted to be able to
   // define custom getters and setters from within a unique security content
@@ skipping 26 matching lines @@
 #endif
 
   // 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();
 };
 
 #endif  // WEBKIT_COMMON_WEBPREFERENCES_H__