cc: Remove support for disabling non-root render surfaces.

cc/layers/layer_impl.cc

 // Copyright 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 "cc/layers/layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 969 matching lines @@
   if (should_have_render_surface) {
     render_surface_ = base::MakeUnique<RenderSurfaceImpl>(this);
     return;
   }
   render_surface_.reset();
 }
 
 gfx::Transform LayerImpl::DrawTransform() const {
   // Only drawn layers have up-to-date draw properties.
   if (!is_drawn_render_surface_layer_list_member()) {
-    if (GetPropertyTrees()->non_root_surfaces_enabled) {
       return draw_property_utils::DrawTransform(this, GetTransformTree(),
                                                 GetEffectTree());
-    } else {
-      return draw_property_utils::ScreenSpaceTransform(this,
-                                                       GetTransformTree());
-    }
   }
 
   return draw_properties().target_space_transform;
 }
 
 gfx::Transform LayerImpl::ScreenSpaceTransform() const {
   // Only drawn layers have up-to-date draw properties.
   if (!is_drawn_render_surface_layer_list_member()) {
     return draw_property_utils::ScreenSpaceTransform(this, GetTransformTree());
   }
@@ skipping 90 matching lines @@
 
 ScrollTree& LayerImpl::GetScrollTree() const {
   return GetPropertyTrees()->scroll_tree;
 }
 
 TransformTree& LayerImpl::GetTransformTree() const {
   return GetPropertyTrees()->transform_tree;
 }
 
 }  // namespace cc