Remove parts of //cc we aren't using

cc/layers/heads_up_display_unittest.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 "cc/layers/layer.h"
-#include "cc/test/layer_tree_test.h"
-#include "cc/trees/layer_tree_host.h"
-
-namespace cc {
-namespace {
-
-class HeadsUpDisplayTest : public LayerTreeTest {
- protected:
-  void InitializeSettings(LayerTreeSettings* settings) override {
-    // Enable the HUD without requiring text.
-    settings->initial_debug_state.show_property_changed_rects = true;
-  }
-};
-
-class DrawsContentLayer : public Layer {
- public:
-  static scoped_refptr<DrawsContentLayer> Create() {
-    return make_scoped_refptr(new DrawsContentLayer());
-  }
-  bool DrawsContent() const override { return true; }
-
- private:
-  DrawsContentLayer() : Layer() {}
-  ~DrawsContentLayer() override {}
-};
-
-class HudWithRootLayerChange : public HeadsUpDisplayTest {
- public:
-  HudWithRootLayerChange()
-      : root_layer1_(DrawsContentLayer::Create()),
-        root_layer2_(DrawsContentLayer::Create()),
-        num_commits_(0) {}
-
-  void BeginTest() override {
-    root_layer1_->SetBounds(gfx::Size(30, 30));
-    root_layer2_->SetBounds(gfx::Size(30, 30));
-
-    PostSetNeedsCommitToMainThread();
-  }
-
-  void DidCommit() override {
-    ++num_commits_;
-
-    ASSERT_TRUE(layer_tree_host()->hud_layer());
-
-    switch (num_commits_) {
-      case 1:
-        // Change directly to a new root layer.
-        layer_tree_host()->SetRootLayer(root_layer1_);
-        break;
-      case 2:
-        EXPECT_EQ(root_layer1_.get(), layer_tree_host()->hud_layer()->parent());
-        // Unset the root layer.
-        layer_tree_host()->SetRootLayer(nullptr);
-        break;
-      case 3:
-        EXPECT_EQ(0, layer_tree_host()->hud_layer()->parent());
-        // Change back to the previous root layer.
-        layer_tree_host()->SetRootLayer(root_layer1_);
-        break;
-      case 4:
-        EXPECT_EQ(root_layer1_.get(), layer_tree_host()->hud_layer()->parent());
-        // Unset the root layer.
-        layer_tree_host()->SetRootLayer(nullptr);
-        break;
-      case 5:
-        EXPECT_EQ(0, layer_tree_host()->hud_layer()->parent());
-        // Change to a new root layer from a null root.
-        layer_tree_host()->SetRootLayer(root_layer2_);
-        break;
-      case 6:
-        EXPECT_EQ(root_layer2_.get(), layer_tree_host()->hud_layer()->parent());
-        // Change directly back to the last root layer/
-        layer_tree_host()->SetRootLayer(root_layer1_);
-        break;
-      case 7:
-        EXPECT_EQ(root_layer1_.get(), layer_tree_host()->hud_layer()->parent());
-        EndTest();
-        break;
-    }
-  }
-
-  void AfterTest() override {}
-
- private:
-  scoped_refptr<DrawsContentLayer> root_layer1_;
-  scoped_refptr<DrawsContentLayer> root_layer2_;
-  int num_commits_;
-};
-
-MULTI_THREAD_TEST_F(HudWithRootLayerChange);
-
-}  // namespace
-}  // namespace cc