Fix leak in ComposedImageFilterOffset test

tests/ImageFilterTest.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 "SkBitmap.h"
 #include "SkBitmapDevice.h"
 #include "SkBitmapSource.h"
@@ skipping 1074 matching lines @@
 
 DEF_TEST(ComposedImageFilterOffset, reporter) {
     SkBitmap bitmap;
     bitmap.allocN32Pixels(100, 100);
     bitmap.eraseARGB(0, 0, 0, 0);
     SkBitmapDevice device(bitmap);
     SkDeviceImageFilterProxy proxy(&device, SkSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType));
 
     SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(1, 0, 20, 20));
     SkAutoTUnref<SkImageFilter> offsetFilter(SkOffsetImageFilter::Create(0, 0, NULL, &cropRect));
-    SkAutoTUnref<SkImageFilter> composedFilter(SkComposeImageFilter::Create(makeBlur(), offsetFilter.get()));
+    SkAutoTUnref<SkImageFilter> blurFilter(makeBlur());
+    SkAutoTUnref<SkImageFilter> composedFilter(SkComposeImageFilter::Create(blurFilter, offsetFilter.get()));
     SkBitmap result;
     SkIPoint offset;
     SkImageFilter::Context ctx(SkMatrix::I(), SkIRect::MakeLargest(), NULL);
     REPORTER_ASSERT(reporter, composedFilter->filterImage(&proxy, bitmap, ctx, &result, &offset));
     REPORTER_ASSERT(reporter, offset.fX == 1 && offset.fY == 0);
 }
 
 #if SK_SUPPORT_GPU
 const SkSurfaceProps gProps = SkSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType);
 
@@ skipping 30 matching lines @@
 DEF_GPUTEST(TestNegativeBlurSigmaGPU, reporter, factory) {
     GrContext* context = factory->get(static_cast<GrContextFactory::GLContextType>(0));
     SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(context,
                                                          SkSurface::kNo_Budgeted,
                                                          SkImageInfo::MakeN32Premul(1, 1),
                                                          0,
                                                          &gProps));
     test_negative_blur_sigma(device, reporter);
 }
 #endif