Remove OwnPtr::release() calls in platform/ (part 2).

third_party/WebKit/Source/platform/testing/TestPaintArtifact.cpp

Index: third_party/WebKit/Source/platform/testing/TestPaintArtifact.cpp
diff --git a/third_party/WebKit/Source/platform/testing/TestPaintArtifact.cpp b/third_party/WebKit/Source/platform/testing/TestPaintArtifact.cpp
index fba9b178dd9a05ffc9cd2c98966407d6f2af18d4..477fdf74f8d2313c20f39407c8259e4b3e747bb5 100644
--- a/third_party/WebKit/Source/platform/testing/TestPaintArtifact.cpp
+++ b/third_party/WebKit/Source/platform/testing/TestPaintArtifact.cpp
@@ -77,7 +77,7 @@ TestPaintArtifact& TestPaintArtifact::rectDrawing(const FloatRect& bounds, Color
     OwnPtr<DummyRectClient> client = adoptPtr(new DummyRectClient(bounds, color));
     m_displayItemList.allocateAndConstruct<DrawingDisplayItem>(
         *client, DisplayItem::DrawingFirst, client->makePicture());
-    m_dummyClients.append(client.release());
+    m_dummyClients.append(std::move(client));
     return *this;
 }
 
@@ -87,7 +87,7 @@ TestPaintArtifact& TestPaintArtifact::foreignLayer(const FloatPoint& location, c
     OwnPtr<DummyRectClient> client = adoptPtr(new DummyRectClient(floatBounds, Color::transparent));
     m_displayItemList.allocateAndConstruct<ForeignLayerDisplayItem>(
         *client, DisplayItem::ForeignLayerFirst, std::move(layer), location, size);
-    m_dummyClients.append(client.release());
+    m_dummyClients.append(std::move(client));
     return *this;
 }