Revert of [GCM] Adding GCMAccountMapper tests

Revert of [GCM] Adding GCMAccountMapper tests (patchset #2 id:20001 of https://codereview.chromium.org/544363002/)

Reason for revert:
GCMAccountMapperTest.MultipleAccountMappings is failing on Win7 Debug.

http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/30987

Original issue's description:
> [GCM] Adding GCMAccountMapper tests
> 
> 1) When the status is ADDING (adding message is sent), the token is refreshed.
> 2) When the status is REMOVING (removing message is sent), the token is added
> again.
> 3) updating multiple account mappings
> 
> BUG=374969
> R=jianli@chromium.org
> 
> Committed: https://chromium.googlesource.com/chromium/src/+/a15249de25304c0d2173029bc22b2f136adac537

TBR=jianli@chromium.org,fgorski@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=374969
Committed: https://crrev.com/185456303fccdc28cd3338661b44457c67607409
Cr-Commit-Position: refs/heads/master@{#293825}

[Noel Gordon, 2014-09-09 00:49:55]

Created Revert of [GCM] Adding GCMAccountMapper tests

[commit-bot: I haz the power, 2014-09-09 00:52:55]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/noel@chromium.org/554153003/1

[commit-bot: I haz the power, 2014-09-09 00:58:01]

Committed patchset #1 (id:1) as 8cd1ffc498b7bb454720f7b16a11dc3f013ebb3c

[commit-bot: I haz the power, 2014-09-10 03:49:23]

Patchset 1 (id:??) landed as
https://crrev.com/185456303fccdc28cd3338661b44457c67607409
Cr-Commit-Position: refs/heads/master@{#293825}