Make SkStream *not* ref counted.

tests/SerializationTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Resources.h"
 #include "SkBitmapSource.h"
 #include "SkCanvas.h"
@@ skipping 332 matching lines @@
     SkCanvas* canvas = recorder.beginRecording(SkIntToScalar(canvasRect.width()), 
                                                SkIntToScalar(canvasRect.height()), 
                                                NULL, 0);
     canvas->drawColor(SK_ColorWHITE);
     canvas->drawText("A!", 2, 24, 32, paint);
     SkAutoTUnref<SkPicture> picture(recorder.endRecording());
 
     // Serlialize picture and create its clone from stream.
     SkDynamicMemoryWStream stream;
     picture->serialize(&stream);
-    SkAutoTUnref<SkStream> inputStream(stream.detachAsStream());
+    SkAutoTDelete<SkStream> inputStream(stream.detachAsStream());
     SkAutoTUnref<SkPicture> loadedPicture(SkPicture::CreateFromStream(inputStream.get()));
 
     // Draw both original and clone picture and compare bitmaps -- they should be identical.
     SkBitmap origBitmap = draw_picture(*picture);
     SkBitmap destBitmap = draw_picture(*loadedPicture);
     compare_bitmaps(reporter, origBitmap, destBitmap);
 }
 
 static void setup_bitmap_for_canvas(SkBitmap* bitmap) {
     bitmap->allocN32Pixels(kBitmapSize, kBitmapSize);
@@ skipping 153 matching lines @@
 
         // Deserialize picture
         SkValidatingReadBuffer reader(static_cast<void*>(data.get()), size);
         SkAutoTUnref<SkPicture> readPict(
             SkPicture::CreateFromBuffer(reader));
         REPORTER_ASSERT(reporter, readPict.get());
     }
 
     TestPictureTypefaceSerialization(reporter);
 }