Fix memory leak in etc1bitmap GM.

gm/etc1bitmap.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkCanvas.h"
 #include "SkData.h"
@@ skipping 20 matching lines @@
     virtual SkISize onISize() SK_OVERRIDE {
         return make_isize(512, 512);
     }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
 
         SkBitmap bm;
         SkString filename = SkOSPath::SkPathJoin(
                 INHERITED::gResourcePath.c_str(), "mandrill_512.pkm");
 
-        SkData *fileData = SkData::NewFromFileName(filename.c_str());
+        SkAutoTUnref<SkData> fileData(SkData::NewFromFileName(filename.c_str()));
         if (NULL == fileData) {
             SkDebugf("Could not open the file. Did you forget to set the resourcePath?\n");
             return;
         }
 
         if (!SkInstallDiscardablePixelRef(
                 SkDecodingImageGenerator::Create(
                     fileData, SkDecodingImageGenerator::Options()), &bm)) {
             SkDebugf("Could not install discardable pixel ref.\n");
             return;
         }
 
         canvas->drawBitmap(bm, 0, 0);
     }
 
 private:
     typedef GM INHERITED;
 };
 
 }  // namespace skiagm
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return SkNEW(skiagm::ETC1BitmapGM); )