cc : Clean up cc clip tree

cc/test/layer_tree_settings_for_testing.h

Index: cc/test/layer_tree_settings_for_testing.h
diff --git a/cc/test/layer_tree_settings_for_testing.h b/cc/test/layer_tree_settings_for_testing.h
deleted file mode 100644
index 6f35b2f9bd072e5e475096b6963d6fbda02f626e..0000000000000000000000000000000000000000
--- a/cc/test/layer_tree_settings_for_testing.h
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright 2016 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_TEST_LAYER_TREE_SETTINGS_FOR_TESTING_H_
-#define CC_TEST_LAYER_TREE_SETTINGS_FOR_TESTING_H_
-
-#include "cc/trees/layer_tree_settings.h"
-
-namespace cc {
-
-class LayerTreeSettingsForTesting : public LayerTreeSettings {
- public:
-  LayerTreeSettingsForTesting();
-  ~LayerTreeSettingsForTesting() override;
-};
-
-}  // namespace cc
-
-#endif  // CC_TEST_LAYER_TREE_SETTINGS_FOR_TESTING_H_