Move to SkDataTable::MakeXXX and sk_sp.

Change SkDataTable::NewXXX to SkDataTable::MakeXXX and return sk_sp.
This updates users of SkDataTable to sk_sp as well.
There do not appear to be any external users of these methods.

Review-Url: https://codereview.chromium.org/2211143002
diff --git a/include/ports/SkFontConfigInterface.h b/include/ports/SkFontConfigInterface.h
index 536768a..30fc8a3 100644
--- a/include/ports/SkFontConfigInterface.h
+++ b/include/ports/SkFontConfigInterface.h
@@ -111,7 +111,7 @@
 
     // New APIS, which have default impls for now (which do nothing)
 
-    virtual SkDataTable* getFamilyNames() { return SkDataTable::NewEmpty(); }
+    virtual sk_sp<SkDataTable> getFamilyNames() { return SkDataTable::MakeEmpty(); }
     typedef SkRefCnt INHERITED;
 };