Fix IMFSample leak in DXVAVideoDecodeAccelerator

media/base/win/mf_helpers.h

Index: media/base/win/mf_helpers.h
diff --git a/media/base/win/mf_helpers.h b/media/base/win/mf_helpers.h
index a99ecedbb3fdbf0dd79b008597dfc9ebaab7c774..4877cbe893f0daa65c9fe2f0b643cf7cb7b38866 100644
--- a/media/base/win/mf_helpers.h
+++ b/media/base/win/mf_helpers.h
@@ -47,9 +47,8 @@ MF_INITIALIZER_EXPORT void LogDXVAError(int line);
 
 // Creates a Media Foundation sample with one buffer of length |buffer_length|
 // on a |align|-byte boundary. Alignment must be a perfect power of 2 or 0.
-MF_INITIALIZER_EXPORT IMFSample* CreateEmptySampleWithBuffer(
-    uint32_t buffer_length,
-    int align);
+MF_INITIALIZER_EXPORT base::win::ScopedComPtr<IMFSample>
+CreateEmptySampleWithBuffer(uint32_t buffer_length, int align);
 
 // Provides scoped access to the underlying buffer in an IMFMediaBuffer
 // instance.
@@ -74,4 +73,4 @@ class MF_INITIALIZER_EXPORT MediaBufferScopedPointer {
 
 }  // namespace media
 
-#endif  // MEDIA_BASE_WIN_MF_HELPERS_H_
+#endif  // MEDIA_BASE_WIN_MF_HELPERS_H_