Add ipv4 version of loopback for peer connection when --allow-loopback-in-peer-connection is set.

Currently, ipv6 support requires constraint specified. It's safe to add
both ipv4 and ipv6 when --allow-loopback-in-peer-connection is set.

BUG=346721
R=mallinath@chromium.org, sergeyu@chromium.org

Review URL: https://codereview.chromium.org/176923024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254487 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254487
gesture nav: Add assets for the alternate UI.

BUG=344573
R=oshima@chromium.org

Review URL: https://codereview.chromium.org/183763015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254488 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254488