decrypting_{audio,video}_decoder_unittest.cc: Remove dead code.

media/filters/decrypting_video_decoder_unittest.cc

Index: media/filters/decrypting_video_decoder_unittest.cc
diff --git a/media/filters/decrypting_video_decoder_unittest.cc b/media/filters/decrypting_video_decoder_unittest.cc
index 0e3b16939f88198b11fecbfceb2f30512c75f98f..7f1b02966faa921470f1013036b1bf3027f97597 100644
--- a/media/filters/decrypting_video_decoder_unittest.cc
+++ b/media/filters/decrypting_video_decoder_unittest.cc
@@ -45,16 +45,6 @@ static scoped_refptr<DecoderBuffer> CreateFakeEncryptedBuffer() {
   return buffer;
 }
 
-// Use anonymous namespace here to prevent the actions to be defined multiple
-// times across multiple test files. Sadly we can't use static for them.
-namespace {
-
-ACTION_P3(ResetAndRunCallback, callback, p1, p2) {
-  base::ResetAndReturn(callback).Run(p1, p2);
-}
-
-}  // namespace
-
 class DecryptingVideoDecoderTest : public testing::Test {
  public:
   DecryptingVideoDecoderTest()