Remove the forceCompositingMode setting.

Source/web/tests/PinchViewportTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "core/frame/PinchViewport.h"
 
 #include "core/frame/FrameHost.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 124 matching lines @@
         WebLayer* webScrollLayer = compositor->scrollLayer()->platformLayer();
         return webScrollLayer;
     }
 
     WebViewImpl* webViewImpl() const { return m_helper.webViewImpl(); }
     LocalFrame* frame() const { return m_helper.webViewImpl()->mainFrameImpl()->frame(); }
 
     static void configureSettings(WebSettings* settings)
     {
         settings->setJavaScriptEnabled(true);
-        settings->setForceCompositingMode(true);
         settings->setAcceleratedCompositingEnabled(true);
         settings->setAcceleratedCompositingForFixedPositionEnabled(true);
         settings->setAcceleratedCompositingForOverflowScrollEnabled(true);
         settings->setCompositedScrollingForFramesEnabled(true);
         settings->setPinchVirtualViewportEnabled(true);
     }
 
     static void configureAndroidSettings(WebSettings* settings)
     {
         configureSettings(settings);
@@ skipping 565 matching lines @@
 
     mouseDownEvent.button = WebMouseEvent::ButtonRight;
     webViewImpl()->handleInputEvent(mouseDownEvent);
     webViewImpl()->handleInputEvent(mouseUpEvent);
 
     // Reset the old client so destruction can occur naturally.
     webViewImpl()->mainFrameImpl()->setClient(oldClient);
 }
 
 } // namespace