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

webrtc/modules/audio_coding/acm2/audio_coding_module.cc

Index: webrtc/modules/audio_coding/acm2/audio_coding_module.cc
diff --git a/webrtc/modules/audio_coding/acm2/audio_coding_module.cc b/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
index ee1034b75a7ebb1dcec199abd3394bdc50a57d0c..dd02964e90810ff4a3c3acf1526fdff9f4074a73 100644
--- a/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
+++ b/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
@@ -536,7 +536,7 @@ int32_t AudioCodingModuleImpl::Encode(const InputData& input_data) {
     frame_type = kEmptyFrame;
     encoded_info.payload_type = previous_pltype;
   } else {
-    RTC_DCHECK_GT(encode_buffer_.size(), 0u);
+    RTC_DCHECK_GT(encode_buffer_.size(), 0);
     frame_type = encoded_info.speech ? kAudioFrameSpeech : kAudioFrameCN;
   }