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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

Review URL: https://codereview.chromium.org/554153003

Cr-Commit-Position: refs/heads/master@{#293825}