Remove the acceleratedCompositingForPluginsEnabled Setting.

Source/core/rendering/compositing/CompositingReasonFinder.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/rendering/compositing/CompositingReasonFinder.h"
 
 #include "CSSPropertyNames.h"
 #include "HTMLNames.h"
 #include "core/frame/FrameView.h"
@@ skipping 29 matching lines @@
 
 void CompositingReasonFinder::updateTriggers()
 {
     m_compositingTriggers = 0;
 
     Settings& settings = m_renderView.document().page()->settings();
     if (settings.acceleratedCompositingFor3DTransformsEnabled())
         m_compositingTriggers |= ThreeDTransformTrigger;
     if (settings.acceleratedCompositingForVideoEnabled())
         m_compositingTriggers |= VideoTrigger;
-    if (settings.acceleratedCompositingForPluginsEnabled())
-        m_compositingTriggers |= PluginTrigger;
     if (settings.acceleratedCompositingForCanvasEnabled())
         m_compositingTriggers |= CanvasTrigger;
     if (settings.acceleratedCompositingForAnimationEnabled())
         m_compositingTriggers |= AnimationTrigger;
     if (settings.compositedScrollingForFramesEnabled())
         m_compositingTriggers |= ScrollableInnerFrameTrigger;
     if (settings.acceleratedCompositingForFiltersEnabled())
         m_compositingTriggers |= FilterTrigger;
     if (settings.acceleratedCompositingForGpuRasterizationHintEnabled())
         m_compositingTriggers |= GPURasterizationTrigger;
@@ skipping 303 matching lines @@
                 *needToRecomputeCompositingRequirements = true;
             }
             return false;
         }
     }
 
     return true;
 }
 
 }