Revert: 178586 Avoid fragmenting address space on small windows systems.

Patch was never properly enabled, and breaks XP when it is enabled. This
is the first step towards getting CPU(32BIT) fixed, at which point this
can be re-implemented and tested properly by CQ given a correct CPU(32BIT)
definition.

BUG=394591
R=cevans@chromium.org

Review URL: https://codereview.chromium.org/721813002

git-svn-id: svn://svn.chromium.org/blink/trunk@185256 bbb929c8-8fbe-4397-9dbb-9b2b20218538