Componentize gcm_account_tracker

Componentize gcm_account_tracker.

Moved chrome/browser/services/gcm/gcm_account_tracker.* and
its related UT file to components/gcm_driver/

BUG=519563
Committed: https://crrev.com/70c5b4cf612a429742c06b6fabaa521b38bc44fc
Cr-Commit-Position: refs/heads/master@{#344288}

[Jitu( very slow this week), 2015-08-18 14:11:11]

jitendra.ks@samsung.com changed reviewers:
+ droger@chromium.org, vivekg@chromium.org

[Jitu( very slow this week), 2015-08-18 14:11:12]

PTAL...

[droger, 2015-08-18 14:14:01]

Nice work, LGTM.

[Jitu( very slow this week), 2015-08-19 05:05:31]

jitendra.ks@samsung.com changed reviewers:
+ fgorski@chromium.org

[Jitu( very slow this week), 2015-08-19 05:05:31]

Dear fgorski,

Please do the OWNER review for below files
  -- chrome/browser/services/gcm/*
  -- components/gcm_driver/*

[droger, 2015-08-19 11:12:24]

CC zea too who is currently involved on iOS-related componentization.

[fgorski, 2015-08-19 16:13:33]

lgtm

[Jitu( very slow this week), 2015-08-19 16:52:08]

The CQ bit was checked by jitendra.ks@samsung.com

[commit-bot: I haz the power, 2015-08-19 16:52:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1293393003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1293393003/1

[commit-bot: I haz the power, 2015-08-19 18:53:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-19 18:54:18]

Patchset 1 (id:??) landed as
https://crrev.com/70c5b4cf612a429742c06b6fabaa521b38bc44fc
Cr-Commit-Position: refs/heads/master@{#344288}