Move UBSan warnings from a blacklist to the source

webrtc/rtc_base/sanitizer.h

 /*
  *  Copyright 2016 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.
  */
 
 #ifndef WEBRTC_RTC_BASE_SANITIZER_H_
 #define WEBRTC_RTC_BASE_SANITIZER_H_
 
+#include <stddef.h>  // for size_t

[kwiberg-webrtc, 2017/09/04 23:09:51]

This sort of comment would be useful, except that they so easily get out of date
that you can't trust them---which makes them useless. Better to just eliminate
the noise.

+
 #if defined(__has_feature)
 #if __has_feature(address_sanitizer)
 #define RTC_HAS_ASAN 1
 #endif
 #if __has_feature(memory_sanitizer)
 #define RTC_HAS_MSAN 1
 #endif
 #endif
 #ifndef RTC_HAS_ASAN
 #define RTC_HAS_ASAN 0
@@ skipping 83 matching lines @@
 template <typename T>
 inline void MsanCheckInitialized(const T& mem) {
   rtc_MsanCheckInitialized(mem.data(), sizeof(mem.data()[0]), mem.size());
 }
 
 }  // namespace rtc
 
 #endif  // __cplusplus
 
 #endif  // WEBRTC_RTC_BASE_SANITIZER_H_