Revert "Update includes for webrtc/{base => rtc_base} rename (2/3)"

webrtc/system_wrappers/source/trace_posix.h

 /*
  *  Copyright (c) 2011 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_SYSTEM_WRAPPERS_SOURCE_TRACE_POSIX_H_
 #define WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_POSIX_H_
 
-#include "webrtc/rtc_base/criticalsection.h"
+#include "webrtc/base/criticalsection.h"
 #include "webrtc/system_wrappers/source/trace_impl.h"
 
 namespace webrtc {
 
 class TracePosix : public TraceImpl {
  public:
   TracePosix();
   ~TracePosix() override = default;
 
   // This method can be called on several different threads different from
   // the creating thread.
   int32_t AddTime(char* trace_message, const TraceLevel level) const override;
 
   int32_t AddDateTimeInfo(char* trace_message) const override;
 
  private:
   volatile mutable uint32_t  prev_api_tick_count_;
   volatile mutable uint32_t  prev_tick_count_;
 
   rtc::CriticalSection crit_sect_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_POSIX_H_