Encrypted Media: DecryptingXxx::SetDecryptor() accepts NULL decryptor.

media/filters/decrypting_audio_decoder_unittest.cc

Index: media/filters/decrypting_audio_decoder_unittest.cc
diff --git a/media/filters/decrypting_audio_decoder_unittest.cc b/media/filters/decrypting_audio_decoder_unittest.cc
index d8b0a5e65fcf9f6c01511c8cad14807b4b138856..1ca19b88c9014b84a4386b09ab7cd3af866c10b9 100644
--- a/media/filters/decrypting_audio_decoder_unittest.cc
+++ b/media/filters/decrypting_audio_decoder_unittest.cc
@@ -270,6 +270,15 @@ TEST_F(DecryptingAudioDecoderTest, Initialize_UnsupportedAudioConfig) {
   InitializeAndExpectStatus(config, DECODER_ERROR_NOT_SUPPORTED);
 }
 
+TEST_F(DecryptingAudioDecoderTest, Initialize_NullDecryptor) {
+  EXPECT_CALL(*this, RequestDecryptorNotification(_))
+      .WillRepeatedly(RunCallbackIfNotNull(static_cast<Decryptor*>(NULL)));
+
+  AudioDecoderConfig config(kCodecVorbis, kSampleFormatPlanarF32,
+                            CHANNEL_LAYOUT_STEREO, 44100, NULL, 0, true);
+  InitializeAndExpectStatus(config, DECODER_ERROR_NOT_SUPPORTED);
+}
+
 // Test normal decrypt and decode case.
 TEST_F(DecryptingAudioDecoderTest, DecryptAndDecode_Normal) {
   Initialize();