Make ui::Layer use the cc:LayerTreeHost scale factor directly

ui/compositor/layer_owner.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 "ui/compositor/layer_owner.h"
 
 #include "ui/compositor/layer_owner_delegate.h"
 
 namespace ui {
 
@@ skipping 22 matching lines @@
     return old_layer.Pass();
 
   LayerDelegate* old_delegate = old_layer->delegate();
   old_layer->set_delegate(NULL);
 
   const gfx::Rect layer_bounds(old_layer->bounds());
   Layer* new_layer = new ui::Layer(old_layer->type());
   SetLayer(new_layer);
   new_layer->SetVisible(old_layer->GetTargetVisibility());
   new_layer->SetOpacity(old_layer->GetTargetOpacity());
-  new_layer->set_scale_content(old_layer->scale_content());
   new_layer->SetBounds(layer_bounds);
   new_layer->SetMasksToBounds(old_layer->GetMasksToBounds());
   new_layer->set_name(old_layer->name());
   new_layer->SetFillsBoundsOpaquely(old_layer->fills_bounds_opaquely());
   new_layer->SetFillsBoundsCompletely(old_layer->FillsBoundsCompletely());
 
   // Install new layer as a sibling of the old layer, stacked below it.
   if (old_layer->parent()) {
     old_layer->parent()->Add(new_layer);
     old_layer->parent()->StackBelow(new_layer, old_layer.get());
@@ skipping 22 matching lines @@
 void LayerOwner::DestroyLayer() {
   layer_ = NULL;
   layer_owner_.reset();
 }
 
 bool LayerOwner::OwnsLayer() const {
   return !!layer_owner_;
 }
 
 }  // namespace ui