Use std::unique_ptr to signal ownership transfer in WebCompositorSupport

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 98 matching lines @@
       m_contentsLayer(0),
       m_contentsLayerId(0),
       m_scrollableArea(nullptr),
       m_renderingContext3d(0) {
 #if ENABLE(ASSERT)
   if (m_client)
     m_client->verifyNotPainting();
 #endif
 
   m_contentLayerDelegate = wrapUnique(new ContentLayerDelegate(this));
-  m_layer =
-      wrapUnique(Platform::current()->compositorSupport()->createContentLayer(
-          m_contentLayerDelegate.get()));
+  m_layer = Platform::current()->compositorSupport()->createContentLayer(
+      m_contentLayerDelegate.get());
   m_layer->layer()->setDrawsContent(m_drawsContent && m_contentsVisible);
   m_layer->layer()->setLayerClient(this);
 }
 
 GraphicsLayer::~GraphicsLayer() {
   for (size_t i = 0; i < m_linkHighlights.size(); ++i)
     m_linkHighlights[i]->clearCurrentGraphicsLayer();
   m_linkHighlights.clear();
 
 #if ENABLE(ASSERT)
@@ skipping 901 matching lines @@
     if (respectImageOrientation == RespectImageOrientation) {
       ImageOrientation imageOrientation =
           toBitmapImage(image)->currentFrameOrientation();
       skImage =
           DragImage::resizeAndOrientImage(std::move(skImage), imageOrientation);
     }
   }
 
   if (image && skImage) {
     if (!m_imageLayer) {
-      m_imageLayer = wrapUnique(
-          Platform::current()->compositorSupport()->createImageLayer());
+      m_imageLayer =
+          Platform::current()->compositorSupport()->createImageLayer();
       registerContentsLayer(m_imageLayer->layer());
     }
     m_imageLayer->setImage(skImage.get());
     m_imageLayer->layer()->setOpaque(image->currentFrameKnownToBeOpaque());
     updateContentsRect();
   } else {
     if (m_imageLayer) {
       unregisterContentsLayer(m_imageLayer->layer());
       m_imageLayer.reset();
     }
@@ skipping 219 matching lines @@
 void showGraphicsLayerTree(const blink::GraphicsLayer* layer) {
   if (!layer) {
     fprintf(stderr, "Cannot showGraphicsLayerTree for (nil).\n");
     return;
   }
 
   String output = layer->layerTreeAsText(blink::LayerTreeIncludesDebugInfo);
   fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif