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

skia/ext/bitmap_platform_device_win.cc

 // 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 <windows.h>
 #include <psapi.h>
 #include <stddef.h>
 
 #include "base/debug/gdi_debug_util_win.h"
 #include "base/logging.h"
@@ skipping 189 matching lines @@
 SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const CreateInfo& cinfo,
                                                    const SkPaint*) {
   const SkImageInfo& info = cinfo.fInfo;
   const bool do_clear = !info.isOpaque();
   SkASSERT(info.colorType() == kN32_SkColorType);
   return Create(info.width(), info.height(), info.isOpaque(), NULL, do_clear);
 }
 
 // PlatformCanvas impl
 
-std::unique_ptr<SkCanvas> CreatePlatformCanvas(int width,
-                                               int height,
-                                               bool is_opaque,
-                                               HANDLE shared_section,
-                                               OnFailureType failureType) {
+SkCanvas* CreatePlatformCanvas(int width,
+                               int height,
+                               bool is_opaque,
+                               HANDLE shared_section,
+                               OnFailureType failureType) {
   sk_sp<SkBaseDevice> dev(
       BitmapPlatformDevice::Create(width, height, is_opaque, shared_section));
   return CreateCanvas(dev, failureType);
 }
 
 }  // namespace skia