switch to new ImageGenerator API

cc/test/skia_common.cc

Index: cc/test/skia_common.cc
diff --git a/cc/test/skia_common.cc b/cc/test/skia_common.cc
index 320bbdd1154414e879953ed015638f5474f9d359..873df1523773ab93ae30447b748385c072b4b30c 100644
--- a/cc/test/skia_common.cc
+++ b/cc/test/skia_common.cc
@@ -6,6 +6,7 @@
 
 #include <stddef.h>
 
+#include "base/memory/ptr_util.h"
 #include "cc/paint/paint_canvas.h"
 #include "cc/playback/display_item_list.h"
 #include "third_party/skia/include/core/SkImageGenerator.h"
@@ -68,7 +69,7 @@ bool AreDisplayListDrawingResultsSame(const gfx::Rect& layer_rect,
 }
 
 sk_sp<SkImage> CreateDiscardableImage(const gfx::Size& size) {
-  return SkImage::MakeFromGenerator(new TestImageGenerator(
+  return SkImage::MakeFromGenerator(base::MakeUnique<TestImageGenerator>(
       SkImageInfo::MakeN32Premul(size.width(), size.height())));
 }