Replace many skia::RefPtr with sk_sp<> in cc/

cc/playback/discardable_image_map_unittest.cc

Index: cc/playback/discardable_image_map_unittest.cc
diff --git a/cc/playback/discardable_image_map_unittest.cc b/cc/playback/discardable_image_map_unittest.cc
index c02de7dc17d076dbf411517a6a8ccdcec158798b..54d497ecb47f18decff2de2a7ab278a98b075f7c 100644
--- a/cc/playback/discardable_image_map_unittest.cc
+++ b/cc/playback/discardable_image_map_unittest.cc
@@ -72,7 +72,7 @@ TEST_F(DiscardableImageMapTest, GetDiscardableImagesInRectTest) {
   // |---|---|---|---|
   // | x |   | x |   |
   // |---|---|---|---|
-  skia::RefPtr<SkImage> discardable_image[4][4];
+  sk_sp<SkImage> discardable_image[4][4];
   for (int y = 0; y < 4; ++y) {
     for (int x = 0; x < 4; ++x) {
       if ((x + y) & 1) {
@@ -149,7 +149,7 @@ TEST_F(DiscardableImageMapTest, GetDiscardableImagesInRectNonZeroLayer) {
   // |---|---|---|---|
   // | x |   | x |   |
   // |---|---|---|---|
-  skia::RefPtr<SkImage> discardable_image[4][4];
+  sk_sp<SkImage> discardable_image[4][4];
   for (int y = 0; y < 4; ++y) {
     for (int x = 0; x < 4; ++x) {
       if ((x + y) & 1) {
@@ -249,7 +249,7 @@ TEST_F(DiscardableImageMapTest, GetDiscardableImagesInRectOnePixelQuery) {
   // |---|---|---|---|
   // | x |   | x |   |
   // |---|---|---|---|
-  skia::RefPtr<SkImage> discardable_image[4][4];
+  sk_sp<SkImage> discardable_image[4][4];
   for (int y = 0; y < 4; ++y) {
     for (int x = 0; x < 4; ++x) {
       if ((x + y) & 1) {
@@ -299,7 +299,7 @@ TEST_F(DiscardableImageMapTest, GetDiscardableImagesInRectMassiveImage) {
   FakeContentLayerClient content_layer_client;
   content_layer_client.set_bounds(visible_rect.size());
 
-  skia::RefPtr<SkImage> discardable_image;
+  sk_sp<SkImage> discardable_image;
   discardable_image = CreateDiscardableImage(gfx::Size(1 << 25, 1 << 25));
   SkPaint paint;
   content_layer_client.add_draw_image(discardable_image.get(), gfx::Point(0, 0),
@@ -331,7 +331,7 @@ TEST_F(DiscardableImageMapTest, PaintDestroyedWhileImageIsDrawn) {
   FakeContentLayerClient content_layer_client;
   content_layer_client.set_bounds(visible_rect.size());
 
-  skia::RefPtr<SkImage> discardable_image;
+  sk_sp<SkImage> discardable_image;
   discardable_image = CreateDiscardableImage(gfx::Size(10, 10));
 
   DiscardableImageMap image_map;