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Namespaces are discouraged in chrome/, as previously discussed on
chromium-dev and recently codified at
https://chromium.googlesource.com/chromium/src/+/master/styleguide/c++/c++-dos-and-donts.md#named-namespaces. This
CL removes the lookalikes:: namespace.

Change-Id: I91cd483630881c4cb29fb5cf3f44ca91b5a767c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877127
Commit-Queue: Emily Stark <estark@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709056}