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Change from 'racing' to 'remote_local_fallback'.  Racing needs more
testing on CQ/CI before making it the default.

Bug: 1149386
Change-Id: I737f27bbd1bcca5b29448882108ad8ec642566ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2635345Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Michael Savigny <msavigny@google.com>
Cr-Commit-Position: refs/heads/master@{#845039}