message: Test logging also with Windows paths.
  Cr-Commit-Position: refs/heads/main@{#37677}
diff: namespace rtc {
  +namespace {
  +
  +#if defined(WEBRTC_WIN)
  +constexpr char kFakeFilePath[] = "some\\path\\myfile.cc";
  +#else
  +constexpr char kFakeFilePath[] = "some/path/myfile.cc";
  +#endif
  +
  +} // namespace
  +
  class LogSinkImpl : public LogSink {
  public:
  explicit LogSinkImpl(std::string* log_data) : log_data_(log_data) {}
  @@ -205,8 +215,8 @@ TEST(LogTest, WallClockStartTime) {
  }
  TEST(LogTest, CheckExtraErrorField) {
  - LogMessageForTesting log_msg("some/path/myfile.cc", 100, LS_WARNING,
  - ERRCTX_ERRNO, 0xD);
  + LogMessageForTesting log_msg(kFakeFilePath, 100, LS_WARNING, ERRCTX_ERRNO,
  + 0xD);
  log_msg.stream() << "This gets added at dtor time";
  const std::string& extra = log_msg.get_extra();
  @@ -224,7 +234,7 @@ TEST(LogTest, CheckFilePathParsed) {
  const char* tag = nullptr;
  #endif
  {
  - LogMessageForTesting log_msg("some/path/myfile.cc", 100, LS_INFO);
  + LogMessageForTesting log_msg(kFakeFilePath, 100, LS_INFO);
  log_msg.stream() << "<- Does this look right?";
  #if defined(WEBRTC_ANDROID)
  tag = log_msg.get_tag();
  