Let RTC_[D]CHECK_op accept arguments of different signedness

webrtc/BUILD.gn

 # Copyright (c) 2014 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.
 
 # TODO(kjellander): Rebase this to webrtc/build/common.gypi changes after r6330.
 
@@ skipping 368 matching lines @@
       "base/proxydetect_unittest.cc",
       "base/random_unittest.cc",
       "base/rate_limiter_unittest.cc",
       "base/rate_statistics_unittest.cc",
       "base/ratelimiter_unittest.cc",
       "base/ratetracker_unittest.cc",
       "base/refcountedobject_unittest.cc",
       "base/rollingaccumulator_unittest.cc",
       "base/rtccertificate_unittest.cc",
       "base/rtccertificategenerator_unittest.cc",
+      "base/safe_compare_unittest.cc",
       "base/scopedptrcollection_unittest.cc",
       "base/sequenced_task_checker_unittest.cc",
       "base/sha1digest_unittest.cc",
       "base/sharedexclusivelock_unittest.cc",
       "base/signalthread_unittest.cc",
       "base/sigslot_unittest.cc",
       "base/sigslottester.h",
       "base/sigslottester.h.pump",
       "base/stream_unittest.cc",
       "base/stringencode_unittest.cc",
@@ skipping 336 matching lines @@
 
       deps = [
         "//base:base_java_test_support",
         "//webrtc/api:libjingle_peerconnection_java",
         "//webrtc/api:libjingle_peerconnection_jni",
         "//webrtc/examples:AppRTCMobile_javalib",
       ]
     }
   }
 }