NetEq: Remove special case for Merge without Expand

webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc

Index: webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc
diff --git a/webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc b/webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc
index 8fba41e7374e5bde4efe4e0c0fdb7e09915bc2cd..1494eeca98ac357ef1aa7cad93d6693214aae264 100644
--- a/webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc
+++ b/webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc
@@ -609,7 +609,7 @@ TEST_F(NetEqImplTest, FirstPacketUnknown) {
   const int kSampleRateHz = 8000;
   const size_t kPayloadLengthSamples =
       static_cast<size_t>(10 * kSampleRateHz / 1000);  // 10 ms.
-  const size_t kPayloadLengthBytes = kPayloadLengthSamples;
+  const size_t kPayloadLengthBytes = kPayloadLengthSamples * 2;
   uint8_t payload[kPayloadLengthBytes] = {0};
   WebRtcRTPHeader rtp_header;
   rtp_header.header.payloadType = kPayloadType;