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When code inside metrics say "prefs" the default assumption is
that it means "::metrics::prefs", *if* the compiler knows that
::metrics::prefs exists. This code wants to use ::prefs which
failed in jumbo build experiments where the compiler knew
that ::metrics::prefs exists.

This patch makes the namespace lookup explicit by writing
::prefs instead of just prefs.

Higher level: The coding standard discourages sub namespaces with
the same name as a top level namespace so it is possible
::metrics::prefs should change name at some time.

Bug: 746957
Change-Id: Ia68378e6a3e7937f5d1b2ebcc960b9111e426fe6
Reviewed-on: https://chromium-review.googlesource.com/890455Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#532934}