add removeLogSink func to LibWebRTCLogging (#118)

Co-authored-by: Igor Ponomarenko <[email protected]>

Author: Slash333

include/rtc_logging.h

@@ -19,6 +19,7 @@ namespace libwebrtc {
     public:
       LIB_WEBRTC_API static void setMinDebugLogLevel(RTCLoggingSeverity severity);
       LIB_WEBRTC_API static void setLogSink(RTCLoggingSeverity severity, RTCCallbackLoggerMessageHandler callbackHandler);
+      LIB_WEBRTC_API static void removeLogSink();
   };
 }  // namespace libwebrtc
 

src/rtc_logging.cc

@@ -42,7 +42,13 @@ namespace libwebrtc {
   }
 
   void LibWebRTCLogging::setLogSink(RTCLoggingSeverity severity, RTCCallbackLoggerMessageHandler callbackHandler) {
+    removeLogSink();
     log_sink.reset(new CallbackLogSink(callbackHandler));
     rtc::LogMessage::AddLogToStream(log_sink.get(), getNativeLoggingSeverity(severity));
   }
+
+  void LibWebRTCLogging::removeLogSink() {
+    if(log_sink)
+      rtc::LogMessage::RemoveLogToStream(log_sink.get());
+  }
 }  // namespace libwebrtc