Try again to rename one SkJpegUtility.h to remove ambiguity.

This time rename the new codec one, which is not referenced externally.

BUG=skia:

Review URL: https://codereview.chromium.org/1181093008
diff --git a/src/codec/SkJpegDecoderMgr.cpp b/src/codec/SkJpegDecoderMgr.cpp
index e60f466..f0ed452 100644
--- a/src/codec/SkJpegDecoderMgr.cpp
+++ b/src/codec/SkJpegDecoderMgr.cpp
@@ -6,7 +6,7 @@
  */
 
 #include "SkJpegDecoderMgr.h"
-#include "SkJpegUtility.h"
+#include "SkJpegUtility_codec.h"
 
 /*
  * Print information, warning, and error messages