NetEq: Ask AudioDecoder for sample rate instead of passing it as an argument

webrtc/modules/audio_coding/neteq/decoder_database_unittest.cc

Index: webrtc/modules/audio_coding/neteq/decoder_database_unittest.cc
diff --git a/webrtc/modules/audio_coding/neteq/decoder_database_unittest.cc b/webrtc/modules/audio_coding/neteq/decoder_database_unittest.cc
index 1aade2c7c0a26235d534071cd77092f4b95fa343..380e719d1de5b490608e9af544f7b458d8994253 100644
--- a/webrtc/modules/audio_coding/neteq/decoder_database_unittest.cc
+++ b/webrtc/modules/audio_coding/neteq/decoder_database_unittest.cc
@@ -141,7 +141,7 @@ TEST(DecoderDatabase, ExternalDecoder) {
   // Load into database.
   EXPECT_EQ(DecoderDatabase::kOK,
             db.InsertExternal(kPayloadType, NetEqDecoder::kDecoderPCMu,
-                              kCodecName, 8000, &decoder));
+                              kCodecName, &decoder));
   EXPECT_EQ(1, db.Size());
   // Get decoder and make sure we get the external one.
   EXPECT_EQ(&decoder, db.GetDecoder(kPayloadType));