SkTypeface to use SkStreamAsset.

SkTypeface already requires typeface streams to support SkStreamAsset
in practice, and in practice all users are already supplying them.

Review URL: https://codereview.chromium.org/869763002
diff --git a/src/sfnt/SkOTUtils.cpp b/src/sfnt/SkOTUtils.cpp
index 1d3843d..fb82182 100644
--- a/src/sfnt/SkOTUtils.cpp
+++ b/src/sfnt/SkOTUtils.cpp
@@ -33,7 +33,7 @@
     return sum;
 }
 
-SkData* SkOTUtils::RenameFont(SkStream* fontData, const char* fontName, int fontNameLen) {
+SkData* SkOTUtils::RenameFont(SkStreamAsset* fontData, const char* fontName, int fontNameLen) {
 
     // Get the sfnt header.
     SkSFNTHeader sfntHeader;