Remove parts of //cc we aren't using

cc/layers/heads_up_display_layer.h

-// 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.
-
-#ifndef CC_LAYERS_HEADS_UP_DISPLAY_LAYER_H_
-#define CC_LAYERS_HEADS_UP_DISPLAY_LAYER_H_
-
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-#include "cc/base/cc_export.h"
-#include "cc/layers/layer.h"
-
-namespace cc {
-
-class CC_EXPORT HeadsUpDisplayLayer : public Layer {
- public:
-  static scoped_refptr<HeadsUpDisplayLayer> Create();
-
-  void PrepareForCalculateDrawProperties(
-      const gfx::Size& device_viewport, float device_scale_factor);
-
-  scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
-
- protected:
-  HeadsUpDisplayLayer();
-  bool HasDrawableContent() const override;
-
- private:
-  ~HeadsUpDisplayLayer() override;
-
-  DISALLOW_COPY_AND_ASSIGN(HeadsUpDisplayLayer);
-};
-
-}  // namespace cc
-
-#endif  // CC_LAYERS_HEADS_UP_DISPLAY_LAYER_H_