Let RTC_[D]CHECK_op accept arguments of different signedness

webrtc/base/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.
 
 import("//build/config/crypto.gni")
 import("//build/config/ui.gni")
@@ skipping 128 matching lines @@
     "random.cc",
     "random.h",
     "rate_limiter.cc",
     "rate_limiter.h",
     "rate_statistics.cc",
     "rate_statistics.h",
     "ratetracker.cc",
     "ratetracker.h",
     "refcount.h",
     "refcountedobject.h",
+    "safe_compare.h",
     "safe_conversions.h",
     "safe_conversions_impl.h",
     "sanitizer.h",
     "scoped_ref_ptr.h",
     "stringencode.cc",
     "stringencode.h",
     "stringutils.cc",
     "stringutils.h",
     "swap_queue.h",
     "systeminfo.cc",
@@ skipping 639 matching lines @@
       "java/src/org/webrtc/Logging.java",
       "java/src/org/webrtc/Size.java",
       "java/src/org/webrtc/ThreadUtils.java",
     ]
 
     deps = [
       "//base:base_java",
     ]
   }
 }