Revert Enable new multicol for testing and experimental web platform features.

Source/web/WebSettingsImpl.cpp

 /*
  * Copyright (C) 2009 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 459 matching lines @@
     m_settings->setWebAudioEnabled(enabled);
 }
 
 void WebSettingsImpl::setExperimentalWebGLEnabled(bool enabled)
 {
     m_settings->setWebGLEnabled(enabled);
 }
 
 void WebSettingsImpl::setRegionBasedColumnsEnabled(bool enabled)
 {
-    // TODO(mstensho): Get rid of this method. Cannot do it yet, because it's still called from the
-    // Chromium side. See crbug.com/350853
+    m_settings->setRegionBasedColumnsEnabled(enabled);
 }
 
 void WebSettingsImpl::setOpenGLMultisamplingEnabled(bool enabled)
 {
     m_settings->setOpenGLMultisamplingEnabled(enabled);
 }
 
 void WebSettingsImpl::setRenderVSyncNotificationEnabled(bool enabled)
 {
     m_renderVSyncNotificationEnabled = enabled;
@@ skipping 284 matching lines @@
 {
     m_settings->setV8CacheOptions(static_cast<blink::V8CacheOptions>(options));
 }
 
 void WebSettingsImpl::setUseMobileViewportStyle(bool enabled)
 {
     m_devToolsEmulator->setUseMobileViewportStyle(enabled);
 }
 
 } // namespace blink