cc: Remove SetNeedsUpdate function from cc::Layer

cc/test/layer_internals_for_test.h

-// 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_INTERNALS_FOR_TEST_H_
-#define CC_TEST_LAYER_INTERNALS_FOR_TEST_H_
-
-#include "base/macros.h"
-#include "cc/layers/layer.h"
-
-namespace cc {
-
-// Utility class to give tests access to Layer private methods.
-class LayerInternalsForTest {
- public:
-  explicit LayerInternalsForTest(Layer* layer);
-
-  void OnOpacityAnimated(float opacity);
-  void OnTransformAnimated(const gfx::Transform& transform);
-  void OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset);
-
- private:
-  Layer* layer_;
-};
-
-}  // namespace cc
-
-#endif  // CC_TEST_LAYER_INTERNALS_FOR_TEST_H_