Use std::unique_ptr to signal ownership transfer in WebCompositorSupport

third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.cpp

 // 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 "platform/graphics/compositing/PaintArtifactCompositor.h"
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/picture_layer.h"
 #include "cc/playback/display_item_list.h"
@@ skipping 145 matching lines @@
   String m_debugName;
   scoped_refptr<cc::PictureLayer> m_ccPictureLayer;
   scoped_refptr<cc::DisplayItemList> m_ccDisplayItemList;
   gfx::Rect m_paintableRegion;
 };
 
 PaintArtifactCompositor::PaintArtifactCompositor() {
   if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled())
     return;
   m_rootLayer = cc::Layer::Create();
-  m_webLayer = wrapUnique(
-      Platform::current()->compositorSupport()->createLayerFromCCLayer(
-          m_rootLayer.get()));
+  m_webLayer = Platform::current()->compositorSupport()->createLayerFromCCLayer(
+      m_rootLayer.get());
   m_isTrackingRasterInvalidations = false;
 }
 
 PaintArtifactCompositor::~PaintArtifactCompositor() {}
 
 void PaintArtifactCompositor::setTracksRasterInvalidations(
     bool tracksPaintInvalidations) {
   resetTrackedRasterInvalidations();
   m_isTrackingRasterInvalidations = tracksPaintInvalidations;
 }
@@ skipping 583 matching lines @@
   }
   m_contentLayerClients.clear();
   m_contentLayerClients.swap(newContentLayerClients);
 
   // Mark the property trees as having been rebuilt.
   layerTree->property_trees()->sequence_number = kPropertyTreeSequenceNumber;
   layerTree->property_trees()->needs_rebuild = false;
 }
 
 }  // namespace blink