Remove another caller of SkRef(SkStream)

TBR=bungeman@google.com
NOTRY=true
NOTREECHECKS=true

Review URL: https://codereview.chromium.org/860353005
diff --git a/src/ports/SkFontHost_linux.cpp b/src/ports/SkFontHost_linux.cpp
index b6fab62..04792f8 100644
--- a/src/ports/SkFontHost_linux.cpp
+++ b/src/ports/SkFontHost_linux.cpp
@@ -85,7 +85,7 @@
     SkTypeface_Stream(const SkFontStyle& style, bool isFixedPitch, bool sysFont,
                       const SkString familyName, SkStream* stream, int index)
         : INHERITED(style, isFixedPitch, sysFont, familyName, index)
-        , fStream(SkRef(stream))
+        , fStream(stream)
     { }
 
     const char* getUniqueString() const SK_OVERRIDE { return NULL; }