Make SkStream *not* ref counted.

src/images/SkJpegUtility.cpp

Index: src/images/SkJpegUtility.cpp
diff --git a/src/images/SkJpegUtility.cpp b/src/images/SkJpegUtility.cpp
index e17b55b31ec29742261adc82d90eb86c521df001..937c5ec6f6f343f44b7a1fe06b9df7d1846fab91 100644
--- a/src/images/SkJpegUtility.cpp
+++ b/src/images/SkJpegUtility.cpp
@@ -96,7 +96,7 @@ static void sk_term_source(j_decompress_ptr /*cinfo*/) {}
 ///////////////////////////////////////////////////////////////////////////////
 
 skjpeg_source_mgr::skjpeg_source_mgr(SkStream* stream, SkImageDecoder* decoder)
-    : fStream(SkRef(stream))
+    : fStream(stream)
     , fDecoder(decoder) {
 
     init_source = sk_init_source;
@@ -110,10 +110,6 @@ skjpeg_source_mgr::skjpeg_source_mgr(SkStream* stream, SkImageDecoder* decoder)
 //    SkDebugf("**************** use memorybase %p %d\n", fMemoryBase, fMemoryBaseSize);
 }
 
-skjpeg_source_mgr::~skjpeg_source_mgr() {
-    SkSafeUnref(fStream);
-}
-
 ///////////////////////////////////////////////////////////////////////////////
 
 static void sk_init_destination(j_compress_ptr cinfo) {