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/tools/debugger/SkDrawCommand.cpp b/tools/debugger/SkDrawCommand.cpp
index c1f0677..5766689 100644
--- a/tools/debugger/SkDrawCommand.cpp
+++ b/tools/debugger/SkDrawCommand.cpp
@@ -922,7 +922,7 @@
 
     std::unique_ptr<SkBitmap> bitmap(new SkBitmap());
     if (nullptr != image) {
-        if (!image->asLegacyBitmap(bitmap.get(), SkImage::kRW_LegacyBitmapMode)) {
+        if (!image->asLegacyBitmap(bitmap.get())) {
             SkDebugf("image decode failed\n");
             return nullptr;
         }