Revert 161469 "Enable chromium_code=1 on Windows"

Seems to be the cause of Windows x64 build breakage, preventing Blink rolls.

> Enable chromium_code=1 on Windows
> 
> TBR=dglazkov@chromium.org
> R=thakis@chromium.org
> BUG=312287
> 
> Review URL: https://codereview.chromium.org/60113005

TBR=scottmg@chromium.org

Review URL: https://codereview.chromium.org/61733005

git-svn-id: svn://svn.chromium.org/blink/trunk@161482 bbb929c8-8fbe-4397-9dbb-9b2b20218538