Refactor: clean up some unused or mostly-unused API I saw here.

BUG=
R=bungeman@google.com, reed@google.com

Author: mtklein@google.com

Review URL: https://chromiumcodereview.appspot.com/17414003

git-svn-id: http://skia.googlecode.com/svn/trunk@9668 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/DataRefTest.cpp b/tests/DataRefTest.cpp
index b6daaf9..313a610 100644
--- a/tests/DataRefTest.cpp
+++ b/tests/DataRefTest.cpp
@@ -273,7 +273,7 @@
         if (!writer.isValid()) {
             SkString msg;
             msg.printf("Failed to create tmp file %s\n", path.c_str());
-            reporter->reportFailed(msg.c_str());
+            reporter->reportFailed(msg);
             return;
         }
         writer.write(s, 26);