Use bitmap.asImage()

Change-Id: Ie16194937530d7cd75f84d9af66c31b77875ef83
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/347043
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/docs/examples/UnpremulBugs.cpp b/docs/examples/UnpremulBugs.cpp
index 69a249e..845b25b 100644
--- a/docs/examples/UnpremulBugs.cpp
+++ b/docs/examples/UnpremulBugs.cpp
@@ -15,7 +15,7 @@
     SkBitmap bmp;
     bmp.allocPixels(info);
     fill(bmp, c, n);
-    sk_sp<SkImage> img = SkImage::MakeFromBitmap(bmp);
+    sk_sp<SkImage> img = bmp.asImage();
 
     SkPaint paint;
     const SkTileMode tile = SkTileMode::kRepeat;