RTC_[D]CHECK_op: Remove superfluous casts

webrtc/pc/mediasession.cc

 /*
  *  Copyright 2004 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 100 matching lines @@
       rtc::SrtpCryptoSuiteFromName(cipher), &key_len, &salt_len)) {
     return false;
   }
 
   int master_key_len = key_len + salt_len;
   std::string master_key;
   if (!rtc::CreateRandomData(master_key_len, &master_key)) {
     return false;
   }
 
-  RTC_CHECK_EQ(static_cast<size_t>(master_key_len), master_key.size());
+  RTC_CHECK_EQ(master_key_len, master_key.size());
   std::string key = rtc::Base64::Encode(master_key);
 
   out->tag = tag;
   out->cipher_suite = cipher;
   out->key_params = kInline;
   out->key_params += key;
   return true;
 }
 
 #ifdef HAVE_SRTP
@@ skipping 2058 matching lines @@
       GetFirstMediaContentDescription(sdesc, MEDIA_TYPE_VIDEO));
 }
 
 DataContentDescription* GetFirstDataContentDescription(
     SessionDescription* sdesc) {
   return static_cast<DataContentDescription*>(
       GetFirstMediaContentDescription(sdesc, MEDIA_TYPE_DATA));
 }
 
 }  // namespace cricket