Remove ambiguity of SkJpegUtility name.

We have two, one in images/, the other in codec/.  As codec's the new hotness,
I left it's name vanilla and suffixed the old one.

BUG=skia:

Review URL: https://codereview.chromium.org/1185733002
diff --git a/src/images/SkImageDecoder_libjpeg.cpp b/src/images/SkImageDecoder_libjpeg.cpp
index 8e92dd8..f868de4 100644
--- a/src/images/SkImageDecoder_libjpeg.cpp
+++ b/src/images/SkImageDecoder_libjpeg.cpp
@@ -8,7 +8,7 @@
 
 #include "SkImageDecoder.h"
 #include "SkImageEncoder.h"
-#include "SkJpegUtility.h"
+#include "SkJpegUtility_images.h"
 #include "SkColorPriv.h"
 #include "SkDither.h"
 #include "SkScaledBitmapSampler.h"