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* Fixes an issue with an unrecognized compiler flag.
* Could not get -flto to work and no good error message from the
  failure. Left a TODO to re-enable it.

Bug: None
Change-Id: I683119e43e767ff5b228706bc6b6f68c2282f7a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418993Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808898}