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

webrtc/modules/utility/source/audio_frame_operations_unittest.cc

Index: webrtc/modules/utility/source/audio_frame_operations_unittest.cc
diff --git a/webrtc/modules/utility/source/audio_frame_operations_unittest.cc b/webrtc/modules/utility/source/audio_frame_operations_unittest.cc
index 5842b90c0a28a490e9ad7f8c2dfedade9719de56..8f83e051ee19ffc8af6f8533532bc4c926be1f2b 100644
--- a/webrtc/modules/utility/source/audio_frame_operations_unittest.cc
+++ b/webrtc/modules/utility/source/audio_frame_operations_unittest.cc
@@ -53,7 +53,7 @@ void VerifyFramesAreEqual(const AudioFrame& frame1, const AudioFrame& frame2) {
 void InitFrame(AudioFrame* frame, size_t channels, size_t samples_per_channel,
                int16_t left_data, int16_t right_data) {
   RTC_DCHECK(frame);
-  RTC_DCHECK_GE(2u, channels);
+  RTC_DCHECK_GE(2, channels);
   RTC_DCHECK_GE(AudioFrame::kMaxDataSizeSamples,
                 samples_per_channel * channels);
   frame->samples_per_channel_ = samples_per_channel;