remove SK_SUPPORT_LEGACY_BITMAPFLATTEN code

src/effects/SkBitmapSource.cpp

Index: src/effects/SkBitmapSource.cpp
diff --git a/src/effects/SkBitmapSource.cpp b/src/effects/SkBitmapSource.cpp
index 79f6e92c1d80512629ccdb6aa379b95b3ba4db83..d8d4329e655a5a698b15eda987944934a50ac60e 100644
--- a/src/effects/SkBitmapSource.cpp
+++ b/src/effects/SkBitmapSource.cpp
@@ -28,7 +28,7 @@ SkBitmapSource::SkBitmapSource(const SkBitmap& bitmap, const SkRect& srcRect, co
 
 SkBitmapSource::SkBitmapSource(SkReadBuffer& buffer) : INHERITED(0, buffer) {
     if (buffer.isVersionLT(SkReadBuffer::kNoMoreBitmapFlatten_Version)) {
-        fBitmap.unflatten(buffer);
+        fBitmap.legacyUnflatten(buffer);
     } else {
         buffer.readBitmap(&fBitmap);
     }