Revert "Fix CPU(32BIT) definition"

This reverts commit c80133d17fe11102619db29cfe9dc4cdda4603ce.

Speculative revert to try to un-crashify WinXP bots:

http://build.chromium.org/p/chromium.webkit/builders/WebKit%20XP/builds/15182

TBR=hiroshige
BUG=

Review URL: https://codereview.chromium.org/718083002

git-svn-id: svn://svn.chromium.org/blink/trunk@185212 bbb929c8-8fbe-4397-9dbb-9b2b20218538