Allow multiple logging::LogMessage{Handler,Listener}s

remoting/host/native_messaging/log_message_handler.cc

Index: remoting/host/native_messaging/log_message_handler.cc
diff --git a/remoting/host/native_messaging/log_message_handler.cc b/remoting/host/native_messaging/log_message_handler.cc
index 70f744b87e87b1d5ddcd84c486a7b06c720dc715..1da7659d218301dd56710daec85bdaabb92cc2fc 100644
--- a/remoting/host/native_messaging/log_message_handler.cc
+++ b/remoting/host/native_messaging/log_message_handler.cc
@@ -37,31 +37,22 @@ LogMessageHandler::LogMessageHandler(
     LOG(FATAL) << "LogMessageHandler is already registered. Only one instance "
                << "per process is allowed.";
   }
-  previous_log_message_handler_ = logging::GetLogMessageHandler();
-  logging::SetLogMessageHandler(&LogMessageHandler::OnLogMessage);
   g_log_message_handler = this;
 }
 
 LogMessageHandler::~LogMessageHandler() {
   base::AutoLock lock(g_log_message_handler_lock.Get());
-  if (logging::GetLogMessageHandler() != &LogMessageHandler::OnLogMessage) {
-    LOG(FATAL) << "LogMessageHandler is not the top-most message handler. "
-               << "Cannot unregister.";
-  }
-  logging::SetLogMessageHandler(previous_log_message_handler_);
   g_log_message_handler = nullptr;
 }
 
 // static
 const char* LogMessageHandler::kDebugMessageTypeName = "_debug_log";
 
-// static
-bool LogMessageHandler::OnLogMessage(
-    logging::LogSeverity severity,
-    const char* file,
-    int line,
-    size_t message_start,
-    const std::string& str) {
+bool LogMessageHandler::OnMessage(logging::LogSeverity severity,
+                                  const char* file,
+                                  int line,
+                                  size_t message_start,
+                                  const std::string& str) {
   base::AutoLock lock(g_log_message_handler_lock.Get());
   if (g_log_message_handler) {
     g_log_message_handler->PostLogMessageToCorrectThread(