remove kRW_LegacyBitmapMode

experiment to see if there are any unknown dependencies
on kRW_LegacyBitmapMode

R=reed@google.com,fmalita@chromium.org,bungeman@google.com
Bug: skia:5615
Change-Id: I2cc578570ac18cd31c3520e1bd801f4a7a669347
Reviewed-on: https://skia-review.googlesource.com/105283
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Cary Clark <caryclark@google.com>
diff --git a/tests/SurfaceTest.cpp b/tests/SurfaceTest.cpp
index de1cd9a..a598c1c 100644
--- a/tests/SurfaceTest.cpp
+++ b/tests/SurfaceTest.cpp
@@ -1042,7 +1042,7 @@
     sk_sp<SkImage> image = surface->makeImageSnapshot();
 
     SkBitmap bitmap;
-    image->asLegacyBitmap(&bitmap, SkImage::kRO_LegacyBitmapMode);
+    image->asLegacyBitmap(&bitmap);
     for (int y = 0; y < 10; y++) {
         for (int x = 0; x < 10; x++) {
             REPORTER_ASSERT(r, 1 == SkGetPackedA32(*bitmap.getAddr32(x, y)));