fix memory leak introduced in 9e5f85e8

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 "SkBitmapDevice.h"
 #include "SkBitmapSource.h"
 #include "SkCanvas.h"
@@ skipping 365 matching lines @@
 
         // Serialize picture
         SkWriteBuffer writer(SkWriteBuffer::kValidation_Flag);
         pict->flatten(writer);
         size_t size = writer.bytesWritten();
         void* data = sk_malloc_throw(size);
         writer.writeToMemory(data);
 
         // Deserialize picture
         SkValidatingReadBuffer reader(data, size);
-        SkPicture* readPict(SkPicture::CreateFromBuffer(reader));
-        REPORTER_ASSERT(reporter, NULL != readPict);
+        SkAutoTUnref<SkPicture> readPict(
+            SkPicture::CreateFromBuffer(reader));
+        REPORTER_ASSERT(reporter, NULL != readPict.get());
     }
 }