Revert of Profile_Metrics integration with Keystone

Revert of Profile_Metrics integration with Keystone (patchset #20 id:530001 of https://codereview.chromium.org/593243002/)

Reason for revert:
crbug.com/463900. Mac crashed, like, all the time.

Original issue's description:
> Profile_Metrics integration with Keystone
>
> Chromium side of the implementation of tracking profile stats (number of profiles, number of signed in profiles) through the Omaha channel for Mac. Design doc: https://docs.google.com/a/google.com/document/d/15Ou8VCYNCZvke8Bw9bF3vYqD67voJBPyx_GBR8ONcCw/edit?disco=AAAAAKU7Zzg (Googler Only)
>
> BUG=409895
>
> Committed: https://crrev.com/0bcaa8e521eae39a81b4754f8b4ac9de1f0463d5
> Cr-Commit-Position: refs/heads/master@{#318729}

TBR=bcwhite@chromium.org,borisv@chromium.org,mark@chromium.org,grt@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=409895
Committed: https://crrev.com/41c1eeb5fa7f3356860d9c00afa547d10e26b79d
Cr-Commit-Position: refs/heads/master@{#319125}

[Mike Lerman, 2015-03-04 21:02:22]

Created Revert of Profile_Metrics integration with Keystone

[commit-bot: I haz the power, 2015-03-04 21:03:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/974423002/1

[commit-bot: I haz the power, 2015-03-04 21:04:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-04 21:05:16]

Patchset 1 (id:??) landed as
https://crrev.com/41c1eeb5fa7f3356860d9c00afa547d10e26b79d
Cr-Commit-Position: refs/heads/master@{#319125}