Replace hide-scrollbars flag with a web setting.

third_party/WebKit/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 519 matching lines @@
 void WebSettingsImpl::setAcceleratedCompositingEnabled(bool enabled)
 {
     m_settings->setAcceleratedCompositingEnabled(enabled);
 }
 
 void WebSettingsImpl::setMockScrollbarsEnabled(bool enabled)
 {
     m_settings->setMockScrollbarsEnabled(enabled);
 }
 
+void WebSettingsImpl::setHideScrollbars(bool enabled)
+{
+    m_settings->setHideScrollbars(enabled);
+}
+
 void WebSettingsImpl::setMockGestureTapHighlightsEnabled(bool enabled)
 {
     m_settings->setMockGestureTapHighlightsEnabled(enabled);
 }
 
 void WebSettingsImpl::setAccelerated2dCanvasMSAASampleCount(int count)
 {
     m_settings->setAccelerated2dCanvasMSAASampleCount(count);
 }
 
@@ skipping 247 matching lines @@
 {
     m_settings->setV8CacheStrategiesForCacheStorage(static_cast<blink::V8CacheStrategiesForCacheStorage>(strategies));
 }
 
 void WebSettingsImpl::setViewportStyle(WebViewportStyle style)
 {
     m_devToolsEmulator->setViewportStyle(style);
 }
 
 } // namespace blink