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

webrtc/modules/utility/source/audio_frame_operations_unittest.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 35 matching lines @@
             frame2.samples_per_channel_);
   for (size_t i = 0; i < frame1.samples_per_channel_ * frame1.num_channels_;
       i++) {
     EXPECT_EQ(frame1.data_[i], frame2.data_[i]);
   }
 }
 
 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;
   frame->num_channels_ = channels;
   if (channels == 2) {
     SetFrameData(frame, left_data, right_data);
   } else if (channels == 1) {
     SetFrameData(frame, left_data);
   }
 }
@@ skipping 293 matching lines @@
 
   AudioFrame scaled_frame;
   scaled_frame.samples_per_channel_ = 320;
   scaled_frame.num_channels_ = 1;
   SetFrameData(&scaled_frame, 2);
   VerifyFramesAreEqual(scaled_frame, frame_);
 }
 
 }  // namespace
 }  // namespace webrtc