Make linux reference build 32-bit. We have some 32-bit bots still.

BUG=347228
TBR=matthewyuan@chromium.org
NOTRY=True

Review URL: https://codereview.chromium.org/190723014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256274 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256275 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256275