Remove parts of //cc we aren't using

cc/layers/solid_color_layer.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/solid_color_layer.h"
-
-#include "cc/layers/solid_color_layer_impl.h"
-
-namespace cc {
-
-scoped_ptr<LayerImpl> SolidColorLayer::CreateLayerImpl(
-    LayerTreeImpl* tree_impl) {
-  return SolidColorLayerImpl::Create(tree_impl, id());
-}
-
-scoped_refptr<SolidColorLayer> SolidColorLayer::Create() {
-  return make_scoped_refptr(new SolidColorLayer());
-}
-
-SolidColorLayer::SolidColorLayer()
-    : Layer() {}
-
-SolidColorLayer::~SolidColorLayer() {}
-
-void SolidColorLayer::SetBackgroundColor(SkColor color) {
-  SetContentsOpaque(SkColorGetA(color) == 255);
-  Layer::SetBackgroundColor(color);
-}
-
-}  // namespace cc