Set default fixed-position compositing setting to disabled

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 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 "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 524 matching lines @@
     return false;
 
   if (command_line.HasSwitch(switches::kEnableCompositingForFixedPosition))
     return true;
 
   if (device_scale_factor > 1.0f &&
       command_line.HasSwitch(
           switches::kEnableHighDpiCompositingForFixedPosition))
     return true;
 
-  // Default, when no switches are specified, is also dependent on high-DPI.
-  return device_scale_factor > 1.0f;
+  // Default, when no switches are specified, is disabled.
+  return false;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 struct RenderViewImpl::PendingFileChooser {
   PendingFileChooser(const FileChooserParams& p, WebFileChooserCompletion* c)
       : params(p),
         completion(c) {
   }
   FileChooserParams params;
@@ skipping 5974 matching lines @@
   TransportDIB* dib = TransportDIB::CreateWithHandle(dib_handle);
   RenderProcess::current()->ReleaseTransportDIB(dib);
 }
 
 void RenderViewImpl::DidCommitCompositorFrame() {
   RenderWidget::DidCommitCompositorFrame();
   FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidCommitCompositorFrame());
 }
 
 }  // namespace content