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

webrtc/modules/rtp_rtcp/source/rtp_packet_history.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 27 matching lines @@
       Free();
     }
     RTC_DCHECK(!store_);
     Allocate(number_to_store);
   } else {
     Free();
   }
 }
 
 void RtpPacketHistory::Allocate(size_t number_to_store) {
-  RTC_DCHECK_GT(number_to_store, 0u);
+  RTC_DCHECK_GT(number_to_store, 0);
   RTC_DCHECK_LE(number_to_store, kMaxCapacity);
   store_ = true;
   stored_packets_.resize(number_to_store);
 }
 
 void RtpPacketHistory::Free() {
   if (!store_) {
     return;
   }
 
@@ skipping 153 matching lines @@
         (stored_size > size) ? (stored_size - size) : (size - stored_size);
     if (diff < min_diff) {
       min_diff = diff;
       best_index = static_cast<int>(i);
     }
   }
   return best_index;
 }
 
 }  // namespace webrtc