Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/paint/ThemePainterMac.mm

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Google, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 206 matching lines @@
     trackInfo.bounds = IntRect(IntPoint(), inflatedRect.size());
     trackInfo.min = 0;
     trackInfo.max = std::numeric_limits<SInt32>::max();
     trackInfo.value = lround(layoutProgress.position() * nextafter(trackInfo.max, 0));
     trackInfo.trackInfo.progress.phase = lround(layoutProgress.animationProgress() * nextafter(LayoutThemeMac::progressAnimationNumFrames, 0));
     trackInfo.attributes = kThemeTrackHorizontal;
     trackInfo.enableState = LayoutTheme::isActive(layoutObject) ? kThemeTrackActive : kThemeTrackInactive;
     trackInfo.reserved = 0;
     trackInfo.filler1 = 0;
 
-    std::unique_ptr<ImageBuffer> imageBuffer = ImageBuffer::create(inflatedRect.size());
+    OwnPtr<ImageBuffer> imageBuffer = ImageBuffer::create(inflatedRect.size());
     if (!imageBuffer)
         return true;
 
     IntRect clipRect = IntRect(IntPoint(), inflatedRect.size());
     LocalCurrentGraphicsContext localContext(imageBuffer->canvas(), 1, clipRect);
     CGContextRef cgContext = localContext.cgContext();
     HIThemeDrawTrack(&trackInfo, 0, cgContext, kHIThemeOrientationNormal);
 
     GraphicsContextStateSaver stateSaver(paintInfo.context);
 
@@ skipping 303 matching lines @@
     paintInfo.context.rotate(deg2rad(-45.0));
     paintInfo.context.translate(-centerX, -centerY);
 
     paintInfo.context.setFillColor(fillColor);
     paintInfo.context.fillEllipse(unzoomedRect);
 
     return false;
 }
 
 } // namespace blink