Revert of [GCM] Fetching OAuth2 tokens periodically in account tracker

Revert of [GCM] Fetching OAuth2 tokens periodically in account tracker (patchset #7 id:140001 of https://codereview.chromium.org/631343002/)

Reason for revert:
Reverting since it's causing a crash on canary.

Original issue's description:
> [GCM] Fetching OAuth2 tokens periodically in account tracker
>
> BUG=374969
> R=zea@chromium.org
>
> Committed: https://crrev.com/ede4117a85d34a1c117169d538b297020e69de87
> Cr-Commit-Position: refs/heads/master@{#303340}

TBR=zea@chromium.org,fgorski@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=374969
Committed: https://crrev.com/74879efc7b4655dd1def63c53a5f73b46fb511d6
Cr-Commit-Position: refs/heads/master@{#303397}

[matthewyuan, 2014-11-08 22:29:40]

Created Revert of [GCM] Fetching OAuth2 tokens periodically in account tracker

[commit-bot: I haz the power, 2014-11-08 22:30:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/710903002/1

[commit-bot: I haz the power, 2014-11-08 22:30:43]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-11-08 22:30:44]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[kareng, 2014-11-08 22:36:37]

On 2014/11/08 22:30:44, I haz the power (commit-bot) wrote:
> No LGTM from a valid reviewer yet. Only full committers are accepted.
> Even if an LGTM may have been provided, it was from a non-committer,
> _not_ a full super star committer.
> See http://www.chromium.org/getting-involved/become-a-committer
> Note that this has nothing to do with OWNERS files.

LGTM

[kareng, 2014-11-08 22:36:41]

The CQ bit was checked by kareng@google.com

[commit-bot: I haz the power, 2014-11-08 22:36:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/710903002/1

[commit-bot: I haz the power, 2014-11-08 22:37:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-08 22:38:27]

Patchset 1 (id:??) landed as
https://crrev.com/74879efc7b4655dd1def63c53a5f73b46fb511d6
Cr-Commit-Position: refs/heads/master@{#303397}