RTC_[D]CHECK_op: Remove "u" suffix on integer constants

webrtc/modules/audio_coding/acm2/codec_manager.cc

Index: webrtc/modules/audio_coding/acm2/codec_manager.cc
diff --git a/webrtc/modules/audio_coding/acm2/codec_manager.cc b/webrtc/modules/audio_coding/acm2/codec_manager.cc
index d8dcd792c4937b8ac933a53cd2ec1e47be3f4606..afeefc78c2b3fb1d4488b20b117f5a3e1c03382b 100644
--- a/webrtc/modules/audio_coding/acm2/codec_manager.cc
+++ b/webrtc/modules/audio_coding/acm2/codec_manager.cc
@@ -211,7 +211,7 @@ bool CodecManager::MakeEncoder(RentACodec* rac, AudioCodingModule* acm) {
         if (sub_enc.empty()) {
           break;
         }
-        RTC_CHECK_EQ(1u, sub_enc.size());
+        RTC_CHECK_EQ(1, sub_enc.size());
 
         // Replace enc with its sub encoder. We need to put the sub encoder in
         // a temporary first, since otherwise the old value of enc would be