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

cc/trees/layer_tree_host_pixeltest_tiles.cc

 // 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.
 
 #include <stddef.h>
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/picture_layer.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/playback/display_item_list.h"
@@ skipping 80 matching lines @@
         test_type = PIXEL_TEST_SOFTWARE;
     }
 
     if (threaded)
       RunPixelTest(test_type, content_root, file_name);
     else
       RunSingleThreadedPixelTest(test_type, content_root, file_name);
   }
 
   base::FilePath ref_file_;
-  scoped_ptr<SkBitmap> result_bitmap_;
+  std::unique_ptr<SkBitmap> result_bitmap_;
   RasterMode raster_mode_;
 };
 
 class BlueYellowClient : public ContentLayerClient {
  public:
   explicit BlueYellowClient(const gfx::Size& size)
       : size_(size), blue_top_(true) {}
 
   gfx::Rect PaintableRegion() override { return gfx::Rect(size_); }
   scoped_refptr<DisplayItemList> PaintContentsToDisplayList(
@@ skipping 122 matching lines @@
        FullRaster_SingleThread_GpuRaster) {
   RunRasterPixelTest(
       false, FULL_GPU, picture_layer_,
       base::FilePath(FILE_PATH_LITERAL("blue_yellow_flipped.png")));
 }
 
 }  // namespace
 }  // namespace cc
 
 #endif  // !defined(OS_ANDROID)