Negotiate on by default on all platforms.
Negotiate on by default on all platforms.

BUG=33033
TEST=Run chrome on POSIX plaforms without explicitly turning on Negotiate.

Review URL: http://codereview.chromium.org/3014013

git-svn-id: http://src.chromium.org/svn/trunk/src@52987 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 88363f25665e5f09e4f4fa5ff3f37533e46a7e1d
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser