Remove parts of //cc we aren't using

cc/layers/heads_up_display_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/heads_up_display_layer.h"
-
-#include <algorithm>
-
-#include "base/trace_event/trace_event.h"
-#include "cc/layers/heads_up_display_layer_impl.h"
-#include "cc/trees/layer_tree_host.h"
-
-namespace cc {
-
-scoped_refptr<HeadsUpDisplayLayer> HeadsUpDisplayLayer::Create() {
-  return make_scoped_refptr(new HeadsUpDisplayLayer());
-}
-
-HeadsUpDisplayLayer::HeadsUpDisplayLayer() {
-  SetIsDrawable(true);
-  UpdateDrawsContent(HasDrawableContent());
-}
-
-HeadsUpDisplayLayer::~HeadsUpDisplayLayer() {}
-
-void HeadsUpDisplayLayer::PrepareForCalculateDrawProperties(
-    const gfx::Size& device_viewport, float device_scale_factor) {
-  gfx::Size device_viewport_in_layout_pixels = gfx::Size(
-      device_viewport.width() / device_scale_factor,
-      device_viewport.height() / device_scale_factor);
-
-  gfx::Size bounds;
-  gfx::Transform matrix;
-  matrix.MakeIdentity();
-
-  if (layer_tree_host()->debug_state().ShowHudRects()) {
-    int max_texture_size =
-        layer_tree_host()->GetRendererCapabilities().max_texture_size;
-    bounds.SetSize(std::min(max_texture_size,
-                            device_viewport_in_layout_pixels.width()),
-                   std::min(max_texture_size,
-                            device_viewport_in_layout_pixels.height()));
-  } else {
-    int size = 256;
-    bounds.SetSize(size, size);
-    matrix.Translate(device_viewport_in_layout_pixels.width() - size, 0.0);
-  }
-
-  SetBounds(bounds);
-  SetTransform(matrix);
-}
-
-bool HeadsUpDisplayLayer::HasDrawableContent() const {
-  return true;
-}
-
-scoped_ptr<LayerImpl> HeadsUpDisplayLayer::CreateLayerImpl(
-    LayerTreeImpl* tree_impl) {
-  return HeadsUpDisplayLayerImpl::Create(tree_impl, layer_id_);
-}
-
-}  // namespace cc