Replace OwnPtr with WTF::Optional for optional recorders.

Source/core/paint/FileUploadControlPainter.cpp

Index: Source/core/paint/FileUploadControlPainter.cpp
diff --git a/Source/core/paint/FileUploadControlPainter.cpp b/Source/core/paint/FileUploadControlPainter.cpp
index 34b3031de96de022954b2cb7d4e69470b34ba2d0..66e7d1d60acb21fe4f35c283a477e5924c94811e 100644
--- a/Source/core/paint/FileUploadControlPainter.cpp
+++ b/Source/core/paint/FileUploadControlPainter.cpp
@@ -11,6 +11,7 @@
 #include "core/paint/LayoutObjectDrawingRecorder.h"
 #include "core/paint/PaintInfo.h"
 #include "platform/graphics/paint/ClipRecorder.h"
+#include "wtf/Optional.h"
 
 namespace blink {
 
@@ -22,14 +23,14 @@ void FileUploadControlPainter::paintObject(const PaintInfo& paintInfo, const Lay
         return;
 
     // Push a clip.
-    OwnPtr<ClipRecorder> clipRecorder;
+    Optional<ClipRecorder> clipRecorder;
     if (paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseChildBlockBackgrounds) {
         IntRect clipRect = enclosingIntRect(LayoutRect(
             LayoutPoint(paintOffset.x() + m_layoutFileUploadControl.borderLeft(), paintOffset.y() + m_layoutFileUploadControl.borderTop()),
             m_layoutFileUploadControl.size() + LayoutSize(0, -m_layoutFileUploadControl.borderWidth() + buttonShadowHeight)));
         if (clipRect.isEmpty())
             return;
-        clipRecorder = adoptPtr(new ClipRecorder(*paintInfo.context, m_layoutFileUploadControl, DisplayItem::ClipFileUploadControlRect, LayoutRect(clipRect)));
+        clipRecorder.emplace(*paintInfo.context, m_layoutFileUploadControl, DisplayItem::ClipFileUploadControlRect, LayoutRect(clipRect));
     }
 
     if (paintInfo.phase == PaintPhaseForeground) {