Remove unused exposed APIs for WebRuntimeFeatures

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 28 matching lines @@
 // Stable features are enabled by default.
 class WebRuntimeFeatures {
 public:
     BLINK_EXPORT static void enableExperimentalFeatures(bool);
     BLINK_EXPORT static void enableTestOnlyFeatures(bool);
 
     BLINK_EXPORT static void enableApplicationCache(bool);
 
     BLINK_EXPORT static void enableDatabase(bool);
 
-    BLINK_EXPORT static void enableDialogElement(bool);
-
     BLINK_EXPORT static void enableEncryptedMedia(bool);
     BLINK_EXPORT static bool isEncryptedMediaEnabled();
 
     BLINK_EXPORT static void enablePrefixedEncryptedMedia(bool);
     BLINK_EXPORT static bool isPrefixedEncryptedMediaEnabled();
 
     BLINK_EXPORT static void enableBleedingEdgeFastPaths(bool);
 
     BLINK_EXPORT static void enableExperimentalCanvasFeatures(bool);
 
@@ skipping 44 matching lines @@
     BLINK_EXPORT static void enableWebAnimationsSVG(bool);
 
     BLINK_EXPORT static void enableWebAudio(bool);
 
     BLINK_EXPORT static void enableWebGLDraftExtensions(bool);
 
     BLINK_EXPORT static void enableWebGLImageChromium(bool);
 
     BLINK_EXPORT static void enableWebMIDI(bool);
 
-    BLINK_EXPORT static void enableHTMLImports(bool);
-
     BLINK_EXPORT static void enableXSLT(bool);
 
     BLINK_EXPORT static void enableOverlayScrollbars(bool);
 
     BLINK_EXPORT static void enableOverlayFullscreenVideo(bool);
 
     BLINK_EXPORT static void enableSharedWorker(bool);
 
-    BLINK_EXPORT static void enableExperimentalWebSocket(bool);
-
     BLINK_EXPORT static void enableTargetedStyleRecalc(bool);
 
     BLINK_EXPORT static void enablePreciseMemoryInfo(bool);
 
     BLINK_EXPORT static void enableLayerSquashing(bool);
 
     BLINK_EXPORT static void enableShowModalDialog(bool);
 
     BLINK_EXPORT static void enableLaxMixedContentChecking(bool);
 
 private:
     WebRuntimeFeatures();
 };
 
 } // namespace blink
 
 #endif