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Otherwise, if proj or pred has base::internal as associated namespace,
ADL can pick up the invoke functions from base::internal, which will
result in ambiguous calls.

Change-Id: I0659762dcb078427e820f5cbb90db807e126601e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2447549Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816568}