Revert 253502 "Add base::TimeDelta::Max()."

> Add base::TimeDelta::Max().
> 
> TimeDelta::Max() is a maximum timedelta, larger than any timedelta you
> can compare it to. The results of adding it to a time, or another time
> delta are undefined.
> 
> R=ajwong@chromium.org,mkwst@chromium.org,jar@chromium.org
> TBR=jamesr@chomium.org,acolwell@chromium.org,nick@chromium.org
> BUG=None
> 
> Review URL: https://codereview.chromium.org/163413004

TBR=gavinp@chromium.org

Review URL: https://codereview.chromium.org/179763006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253643 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253643