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

cc/blink/web_scrollbar_layer_impl.h

 // Copyright 2014 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_BLINK_WEB_SCROLLBAR_LAYER_IMPL_H_
 #define CC_BLINK_WEB_SCROLLBAR_LAYER_IMPL_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "cc/blink/cc_blink_export.h"
 #include "third_party/WebKit/public/platform/WebScrollbar.h"
 #include "third_party/WebKit/public/platform/WebScrollbarLayer.h"
 
 namespace blink {
 class WebScrollbarThemeGeometry;
 class WebScrollbarThemePainter;
 }
 
 namespace cc_blink {
@@ skipping 11 matching lines @@
       int thumb_thickness,
       int track_start,
       bool is_left_side_vertical_scrollbar);
   ~WebScrollbarLayerImpl() override;
 
   // blink::WebScrollbarLayer implementation.
   blink::WebLayer* layer() override;
   void setScrollLayer(blink::WebLayer* layer) override;
 
  private:
-  scoped_ptr<WebLayerImpl> layer_;
+  std::unique_ptr<WebLayerImpl> layer_;
 
   DISALLOW_COPY_AND_ASSIGN(WebScrollbarLayerImpl);
 };
 
 }  // namespace cc_blink
 
 #endif  // CC_BLINK_WEB_SCROLLBAR_LAYER_IMPL_H_