Use std::unique_ptr to signal ownership transfer in WebCompositorSupport

third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp

Index: third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp b/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
index 402465f9f0eee7686aa5bfa9d6dbd236b809426e..0f9a35d76606f2e3aef6adc56d9ec77c091a7d91 100644
--- a/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
@@ -49,7 +49,6 @@
 #include "third_party/skia/include/gpu/GrContext.h"
 #include "third_party/skia/include/gpu/gl/GrGLTypes.h"
 #include "wtf/CheckedNumeric.h"
-#include "wtf/PtrUtil.h"
 #include "wtf/typed_arrays/ArrayBufferContents.h"
 #include <algorithm>
 #include <memory>
@@ -759,9 +758,9 @@ GLuint DrawingBuffer::framebuffer() const {
 
 WebLayer* DrawingBuffer::platformLayer() {
   if (!m_layer) {
-    m_layer = wrapUnique(
+    m_layer =
         Platform::current()->compositorSupport()->createExternalTextureLayer(
-            this));
+            this);
 
     m_layer->setOpaque(!m_wantAlphaChannel);
     m_layer->setBlendBackgroundColor(m_wantAlphaChannel);