Remove Chromium plumbing for fixed-position-creates-stacking-context.

content/browser/renderer_host/render_view_host_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/browser/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 444 matching lines @@
   GpuDataManagerImpl::GetInstance()->UpdateRendererWebPrefs(&prefs);
 
   if (ChildProcessSecurityPolicyImpl::GetInstance()->HasWebUIBindings(
           GetProcess()->GetID())) {
     prefs.loads_images_automatically = true;
     prefs.javascript_enabled = true;
   }
 
   prefs.is_online = !net::NetworkChangeNotifier::IsOffline();
 
-  prefs.fixed_position_creates_stacking_context = !command_line.HasSwitch(
-      switches::kDisableFixedPositionCreatesStackingContext);
-
   prefs.gesture_tap_highlight_enabled = !command_line.HasSwitch(
       switches::kDisableGestureTapHighlight);
 
   prefs.number_of_cpu_cores = base::SysInfo::NumberOfProcessors();
 
   prefs.viewport_meta_enabled =
       command_line.HasSwitch(switches::kEnableViewportMeta);
 
   prefs.viewport_enabled =
       command_line.HasSwitch(switches::kEnableViewport) ||
@@ skipping 1205 matching lines @@
   FrameTree* frame_tree = delegate_->GetFrameTree();
 
   frame_tree->ResetForMainFrameSwap();
 }
 
 void RenderViewHostImpl::SelectWordAroundCaret() {
   Send(new ViewMsg_SelectWordAroundCaret(GetRoutingID()));
 }
 
 }  // namespace content