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This is needed to prevent ADL to pick up the candidates from the
internal namespace when an argument is from the internal namespace as
well, which otherwise results in overload resolution ambiguity.

Change-Id: I2866d738d3ad16a528e05bac93d1b0c4153b2013
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463606Reviewed-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@{#816088}