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Revert of Remove unneeded Friend from chrome_metrics_service_accessor (patchset #1 id:20001 of https://codereview.chromium.org/601243002/)

Reason for revert:
We need to bring this back since the usage of it is coming back in an upcoming patch.

Sorry about that...

BYE
MAD

Original issue's description:
> Remove unneeded Friend from chrome_metrics_service_accessor
>
> BUG=
>
> Committed: https://crrev.com/ca032c3aed93e5afd7c32da76147f36a72dc4341
> Cr-Commit-Position: refs/heads/master@{#296722}

TBR=asvitkine@chromium.org,csharp@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/603173003

Cr-Commit-Position: refs/heads/master@{#296763}