Update code to use helper function for better readability/searching.

Review URL: https://codereview.chromium.org/12834012

git-svn-id: http://skia.googlecode.com/svn/trunk@8287 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/ports/SkFontHost_FreeType.cpp b/src/ports/SkFontHost_FreeType.cpp
index b08aa8e..6a36f44 100644
--- a/src/ports/SkFontHost_FreeType.cpp
+++ b/src/ports/SkFontHost_FreeType.cpp
@@ -1333,7 +1333,7 @@
         args.memory_size = stream->getLength();
     } else {
         memset(&streamRec, 0, sizeof(streamRec));
-        streamRec.size = stream->read(NULL, 0);
+        streamRec.size = stream->getLength();
         streamRec.descriptor.pointer = stream;
         streamRec.read  = sk_stream_read;
         streamRec.close = sk_stream_close;