Make SkStream *not* ref counted.

src/ports/SkImageDecoder_empty.cpp

Index: src/ports/SkImageDecoder_empty.cpp
diff --git a/src/ports/SkImageDecoder_empty.cpp b/src/ports/SkImageDecoder_empty.cpp
index 069cf7fbcbd78b1caaa57ae39088a4e9efc9f9e6..e5ad6da6eb979782541a5adbe8f7ac9081612760 100644
--- a/src/ports/SkImageDecoder_empty.cpp
+++ b/src/ports/SkImageDecoder_empty.cpp
@@ -11,10 +11,9 @@
 #include "SkImageDecoder.h"
 #include "SkImageEncoder.h"
 #include "SkMovie.h"
+#include "SkStream.h"
 
 class SkColorTable;
-class SkStream;
-class SkStreamRewindable;
 
 // Empty implementations for SkImageDecoder.
 
@@ -48,6 +47,13 @@ bool SkImageDecoder::buildTileIndex(SkStreamRewindable*, int *width, int *height
     return false;
 }
 
+bool SkImageDecoder::onBuildTileIndex(SkStreamRewindable* stream,
+                                      int* /*width*/, int* /*height*/) {
+    SkDELETE(stream);
+    return false;
+}
+
+
 bool SkImageDecoder::decodeSubset(SkBitmap*, const SkIRect&, SkColorType) {
     return false;
 }