Support a runtime flag for navigator content utils feature

public/web/WebRuntimeFeatures.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 119 matching lines @@
 
     WEBKIT_EXPORT static void enableWebMIDI(bool);
     WEBKIT_EXPORT static bool isWebMIDIEnabled();
 
     WEBKIT_EXPORT static void enableDataListElement(bool);
     WEBKIT_EXPORT static bool isDataListElementEnabled();
 
     WEBKIT_EXPORT static void enableHTMLImports(bool);
     WEBKIT_EXPORT static bool isHTMLImportsEnabled();
 
+    WEBKIT_EXPORT static void enableNavigatorContentUtils(bool);
+    WEBKIT_EXPORT static bool isNavigatorContentUtilsEnabled();

[abarth-chromium, 2013/08/19 19:18:07]

There's no need for this API.  We can control the feature with the generic
test/experimental/stable API.

[gyuyoung-inactive, 2013/08/20 08:24:37]

I don't understand well. Stable APIs as Geolocation, MediaStream were added to
here. Could you let me know what is difference ?

+
     WEBKIT_EXPORT static void enableCustomElements(bool);
 
     WEBKIT_EXPORT static void enableOverlayScrollbars(bool);
 
 private:
     WebRuntimeFeatures();
 };
 
 } // namespace WebKit
 
 #endif