Convert //cc from scoped_ptr to std::unique_ptr.

cc/test/fake_mask_layer_impl.h

 // Copyright 2015 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_FAKE_MASK_LAYER_IMPL_H_
 #define CC_TEST_FAKE_MASK_LAYER_IMPL_H_
 
 #include "cc/layers/layer_impl.h"
 
 namespace cc {
 
 class FakeMaskLayerImpl : public LayerImpl {
  public:
-  static scoped_ptr<FakeMaskLayerImpl> Create(LayerTreeImpl* tree_impl, int id);
+  static std::unique_ptr<FakeMaskLayerImpl> Create(LayerTreeImpl* tree_impl,
+                                                   int id);
 
   void GetContentsResourceId(ResourceId* resource_id,
                              gfx::Size* resource_size) const override;
 
  private:
   FakeMaskLayerImpl(LayerTreeImpl* tree_impl, int id);
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_MASK_LAYER_IMPL_H_