Build WebRTC with data channel only.

webrtc/logging/rtc_event_log/rtc_event_log.cc

 /*
  *  Copyright (c) 2015 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 562 matching lines @@
   ProtoString dump_buffer;
   while ((bytes_read = dump_file->Read(tmp_buffer, sizeof(tmp_buffer))) > 0) {
     dump_buffer.append(tmp_buffer, bytes_read);
   }
   dump_file->CloseFile();
   return result->ParseFromString(dump_buffer);
 }
 
 #endif  // ENABLE_RTC_EVENT_LOG
 
-bool RtcEventLogNullImpl::StartLogging(rtc::PlatformFile platform_file,
-                                       int64_t max_size_bytes) {
-  // The platform_file is open and needs to be closed.
-  if (!rtc::ClosePlatformFile(platform_file)) {
-    LOG(LS_ERROR) << "Can't close file.";
-  }
-  return false;
-}
-
 // RtcEventLog member functions.
 std::unique_ptr<RtcEventLog> RtcEventLog::Create() {
 #ifdef ENABLE_RTC_EVENT_LOG
   return std::unique_ptr<RtcEventLog>(new RtcEventLogImpl());
 #else
   return std::unique_ptr<RtcEventLog>(new RtcEventLogNullImpl());
 #endif  // ENABLE_RTC_EVENT_LOG
 }
 
 std::unique_ptr<RtcEventLog> RtcEventLog::CreateNull() {
   return std::unique_ptr<RtcEventLog>(new RtcEventLogNullImpl());
 }
 
 }  // namespace webrtc