Revert of Implemented retrieval of alerts history (patchset #4 id:60001 of https://codereview.chromium.org/633983002/)

Reason for revert:
This breaks sheriff-o-matic, although not clear why.

Original issue's description:
> Implemented retrieval of alerts history.
> 
> BUG=416182
> R=ojan@chromium.org
> CC=phajdan.jr@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=183431

TBR=ojan@chromium.org,ojan@google.com
NOTREECHECKS=true
NOTRY=true
BUG=416182

Review URL: https://codereview.chromium.org/643613002

git-svn-id: svn://svn.chromium.org/blink/trunk@183458 bbb929c8-8fbe-4397-9dbb-9b2b20218538