Revert 89486 - Revert 87047 - Revert 86422 - Make DHCP WPAD on by default.

Reason: Turning back on for trunk to collect data as performance worries are addressed.

BUG=18575,84047
TEST=Run Chrome on Windows without any flags. Enable auto-detect in proxy configuration. Net log should show attempts to auto-detect via DHCP.

Review URL: http://codereview.chromium.org/7167016

TBR=joi@chromium.org

NOTE: I'll roll it back in if it turns out this wasn't the problem.
Review URL: http://codereview.chromium.org/7200025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89629 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed