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

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

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=253643

[waffles, 2014-02-27 00:01:40]

Committed patchset #1 manually as r253643.