Revert of Remove WebSettings::setDisallowFullscreenForNonMediaElements(bool)

Source/web/FullscreenController.cpp

 /*
  * 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 137 matching lines @@
                 fullscreen->didExitFullScreenForElement(0);
             }
         }
     }
 
     m_fullScreenFrame.clear();
 }
 
 void FullscreenController::enterFullScreenForElement(blink::Element* element)
 {
+    if (m_webViewImpl->settingsImpl()->disallowFullscreenForNonMediaElements() && !isHTMLMediaElement(element))
+        return;
+
     // We are already transitioning to fullscreen for a different element.
     if (m_provisionalFullScreenElement) {
         m_provisionalFullScreenElement = element;
         return;
     }
 
     // We are already in fullscreen mode.
     if (m_fullScreenFrame) {
         m_provisionalFullScreenElement = element;
         willEnterFullScreen();
@@ skipping 12 matching lines @@
 {
     // The client is exiting full screen, so don't send a notification.
     if (m_isCancelingFullScreen)
         return;
     if (WebViewClient* client = m_webViewImpl->client())
         client->exitFullScreen();
 }
 
 }