Revert of Change call-sites now that SkCanvas is not ref-counted

skia/ext/skia_utils_mac.mm

 // Copyright (c) 2012 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 "skia/ext/skia_utils_mac.h"
 
 #import <AppKit/AppKit.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 172 matching lines @@
                                 count:4];
 }
 
 SkBitmap CGImageToSkBitmap(CGImageRef image) {
   if (!image)
     return SkBitmap();
 
   int width = CGImageGetWidth(image);
   int height = CGImageGetHeight(image);
 
-  std::unique_ptr<SkCanvas> canvas(skia::CreatePlatformCanvas(
+  sk_sp<SkCanvas> canvas(skia::CreatePlatformCanvas(
       nullptr, width, height, false, RETURN_NULL_ON_FAILURE));
   ScopedPlatformPaint p(canvas.get());
   CGContextRef context = p.GetNativeDrawingContext();
 
   // We need to invert the y-axis of the canvas so that Core Graphics drawing
   // happens right-side up. Skia has an upper-left origin and CG has a lower-
   // left one.
   CGContextScaleCTM(context, 1.0, -1.0);
   CGContextTranslateCTM(context, 0, -height);
 
@@ skipping 174 matching lines @@
   CGContextConcatCTM(cgContext_, SkMatrixToCGAffineTransform(matrix));
   
   return cgContext_;
 }
 
 bool SkiaBitLocker::hasEmptyClipRegion() const {
   return canvas_->isClipEmpty();
 }
 
 }  // namespace skia