message: Don't ask for the friendly name of a default device if we failed to enumerate it.
  Cr-Commit-Position: refs/heads/master@{#29778}
diff: @@ -476,6 +476,10 @@ bool GetDeviceNamesInternal(EDataFlow data_flow,
  for (size_t i = 0; i < arraysize(role); ++i) {
  default_device = CreateDeviceInternal(AudioDeviceName::kDefaultDeviceId,
  data_flow, role[i]);
  + if (!default_device.Get()) {
  + return false;
  + }
  +
  std::string device_name;
  device_name += (role[i] == eConsole ? "Default - " : "Communication - ");
  device_name += GetDeviceFriendlyNameInternal(default_device.Get());
  