Fix mouse wheel scrolling on PDFs.

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 190 matching lines @@
 void WebSettingsImpl::setJavaScriptEnabled(bool enabled)
 {
     m_devToolsEmulator->setScriptEnabled(enabled);
 }
 
 void WebSettingsImpl::setWebSecurityEnabled(bool enabled)
 {
     m_settings->setWebSecurityEnabled(enabled);
 }
 
+void WebSettingsImpl::setWheelGesturesEnabled(bool enabled)
+{
+    m_settings->setWheelGesturesEnabled(enabled);
+}
+
 void WebSettingsImpl::setJavaScriptCanOpenWindowsAutomatically(bool canOpenWindows)
 {
     m_settings->setJavaScriptCanOpenWindowsAutomatically(canOpenWindows);
 }
 
 void WebSettingsImpl::setSupportDeprecatedTargetDensityDPI(bool supportDeprecatedTargetDensityDPI)
 {
     m_supportDeprecatedTargetDensityDPI = supportDeprecatedTargetDensityDPI;
 }
 
@@ skipping 571 matching lines @@
 {
     m_settings->setV8CacheOptions(static_cast<blink::V8CacheOptions>(options));
 }
 
 void WebSettingsImpl::setUseMobileViewportStyle(bool enabled)
 {
     m_devToolsEmulator->setUseMobileViewportStyle(enabled);
 }
 
 } // namespace blink