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

cc/trees/layer_tree_host_pixeltest_tiles.cc

 // Copyright 2015 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 <stddef.h>
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/picture_layer.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/playback/display_item_list.h"
@@ skipping 97 matching lines @@
 
   gfx::Rect PaintableRegion() override { return gfx::Rect(size_); }
   scoped_refptr<DisplayItemList> PaintContentsToDisplayList(
       PaintingControlSetting painting_status) override {
     DisplayItemListSettings settings;
     settings.use_cached_picture = false;
     scoped_refptr<DisplayItemList> display_list =
         DisplayItemList::Create(settings);
 
     SkPictureRecorder recorder;
-    SkCanvas* canvas =
-        recorder.beginRecording(gfx::RectToSkRect(gfx::Rect(size_)));
+    sk_sp<SkCanvas> canvas =
+        sk_ref_sp(recorder.beginRecording(gfx::RectToSkRect(gfx::Rect(size_))));
     gfx::Rect top(0, 0, size_.width(), size_.height() / 2);
     gfx::Rect bottom(0, size_.height() / 2, size_.width(), size_.height() / 2);
 
     gfx::Rect blue_rect = blue_top_ ? top : bottom;
     gfx::Rect yellow_rect = blue_top_ ? bottom : top;
 
     SkPaint paint;
     paint.setStyle(SkPaint::kFill_Style);
 
     paint.setColor(SK_ColorBLUE);
@@ skipping 103 matching lines @@
        FullRaster_SingleThread_GpuRaster) {
   RunRasterPixelTest(
       false, FULL_GPU, picture_layer_,
       base::FilePath(FILE_PATH_LITERAL("blue_yellow_flipped.png")));
 }
 
 }  // namespace
 }  // namespace cc
 
 #endif  // !defined(OS_ANDROID)