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These flags were removed in crrev.com/824947 but the thinlto flag was
accidentally left behind.

Bug: 1127713
Change-Id: Iea53c31a0f4a0a7ea09153595646ca6d13a9d45d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627316
Commit-Queue: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Auto-Submit: Hans Wennborg <hans@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843026}