message: Update out of date comment in log_memory for VLOG (NFC).
  LogMemory::IsEnabled is currently set to VLOG_IS_ON(2) instead of VLOG_IS_ON(1).
diff: @@ -55,7 +55,7 @@ class LogMemory {
  static const std::string kLogMemoryLabel;
  // Test to see if memory logging is enabled. For now, logging is
  - // enabled whenever VLOG_IS_ON(1) for the log_memory module.
  + // enabled whenever VLOG_IS_ON(2) for the log_memory module.
  static bool IsEnabled();
  // Log the beginning of a step.
  