Move off SK_SUPPORT_LEGACY_DATA_FACTORIES.

This moves Skia code off of SK_SUPPORT_LEGACY_DATA_FACTORIES.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2206633004

Review-Url: https://codereview.chromium.org/2206633004
diff --git a/src/codec/SkWbmpCodec.cpp b/src/codec/SkWbmpCodec.cpp
index 326fc22..099b6e4 100644
--- a/src/codec/SkWbmpCodec.cpp
+++ b/src/codec/SkWbmpCodec.cpp
@@ -155,8 +155,7 @@
 }
 
 bool SkWbmpCodec::IsWbmp(const void* buffer, size_t bytesRead) {
-    SkAutoTUnref<SkData> data(SkData::NewWithoutCopy(buffer, bytesRead));
-    SkMemoryStream stream(data);
+    SkMemoryStream stream(buffer, bytesRead, false);
     return read_header(&stream, nullptr);
 }