Using lock_guard instead of scoped_lock

Author: ashgti

lldb/tools/lldb-dap/DAPLog.cpp

@@ -10,7 +10,6 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/raw_ostream.h"
 #include <chrono>
-#include <fstream>
 #include <mutex>
 #include <system_error>
 
@@ -21,7 +20,7 @@ namespace lldb_dap {
 Log::Log(StringRef filename, std::error_code &EC) : m_stream(filename, EC) {}
 
 void Log::WriteMessage(StringRef message) {
-  std::scoped_lock<std::mutex> lock(m_mutex);
+  std::lock_guard<std::mutex> lock(m_mutex);
   std::chrono::duration<double> now{
       std::chrono::system_clock::now().time_since_epoch()};
   m_stream << formatv("{0:f9} ", now.count()).str() << message << "\n";