Replace OwnPtr with WTF::Optional for optional recorders.

Source/core/paint/SVGRootPainter.cpp

 // Copyright 2014 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 "config.h"
 #include "core/paint/SVGRootPainter.h"
 
 #include "core/layout/svg/LayoutSVGRoot.h"
 #include "core/layout/svg/SVGResources.h"
 #include "core/layout/svg/SVGResourcesCache.h"
 #include "core/paint/BoxPainter.h"
 #include "core/paint/PaintInfo.h"
 #include "core/paint/SVGPaintContext.h"
 #include "core/paint/TransformRecorder.h"
 #include "core/svg/SVGSVGElement.h"
 #include "platform/graphics/paint/ClipRecorder.h"
+#include "wtf/Optional.h"
 
 namespace blink {
 
 void SVGRootPainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     // An empty viewport disables rendering.
     if (m_layoutSVGRoot.pixelSnappedBorderBoxRect().isEmpty())
         return;
 
     // SVG outlines are painted during PaintPhaseForeground.
@@ skipping 10 matching lines @@
     // Don't paint if we don't have kids, except if we have filters we should paint those.
     if (!m_layoutSVGRoot.firstChild()) {
         SVGResources* resources = SVGResourcesCache::cachedResourcesForLayoutObject(&m_layoutSVGRoot);
         if (!resources || !resources->filter())
             return;
     }
 
     PaintInfo paintInfoBeforeFiltering(paintInfo);
 
     // Apply initial viewport clip.
-    OwnPtr<ClipRecorder> clipRecorder;
+    Optional<ClipRecorder> clipRecorder;
     if (m_layoutSVGRoot.shouldApplyViewportClip()) {
         // TODO(pdr): Clip the paint info cull rect here.
-        clipRecorder = adoptPtr(new ClipRecorder(*paintInfoBeforeFiltering.context, m_layoutSVGRoot, paintInfoBeforeFiltering.displayItemTypeForClipping(), LayoutRect(pixelSnappedIntRect(m_layoutSVGRoot.overflowClipRect(paintOffset)))));
+        clipRecorder.emplace(*paintInfoBeforeFiltering.context, m_layoutSVGRoot, paintInfoBeforeFiltering.displayItemTypeForClipping(), LayoutRect(pixelSnappedIntRect(m_layoutSVGRoot.overflowClipRect(paintOffset))));
     }
 
     // Convert from container offsets (html layoutObjects) to a relative transform (svg layoutObjects).
     // Transform from our paint container's coordinate system to our local coords.
     IntPoint adjustedPaintOffset = roundedIntPoint(paintOffset);
     AffineTransform paintOffsetToBorderBox = AffineTransform::translation(adjustedPaintOffset.x(), adjustedPaintOffset.y()) * m_layoutSVGRoot.localToBorderBoxTransform();
     paintInfoBeforeFiltering.updateCullRectForSVGTransform(paintOffsetToBorderBox);
     TransformRecorder transformRecorder(*paintInfoBeforeFiltering.context, m_layoutSVGRoot, paintOffsetToBorderBox);
 
     SVGPaintContext paintContext(m_layoutSVGRoot, paintInfoBeforeFiltering);
     if (paintContext.paintInfo().phase == PaintPhaseForeground && !paintContext.applyClipMaskAndFilterIfNecessary())
         return;
 
     BoxPainter(m_layoutSVGRoot).paint(paintContext.paintInfo(), LayoutPoint());
 }
 
 } // namespace blink