Fix onLocalDescriptionError callback in WebRtcBrowserTest

Make sure the onLocalDescriptionError callback is set before it can possibly
be called as a side-effect of webkitGetUserMedia().

BUG=339286
TEST=local build, run on desktop Linux

Review URL: https://codereview.chromium.org/149703004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247953 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247953
Change default mode of extension install verification

Right now the default mode is to make requests against the server unless
the experiment group says not to, and that may be contributing to some
unexpected load we're seeing. So this CL changes it to not do that.

It also adds some histograms to help measure the success rate and
sources of requests to the server.

[This is a resubmit of https://codereview.chromium.org/149353002 with a
compile error fixed]

BUG=335379
TBR=finnur@chromium.org

Review URL: https://codereview.chromium.org/150093002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247954 0039d316-1c4b-4281-b951-d872f2087c98
Public pods move to the beginning of user list on sign-in.

BUG=326651

Review URL: https://codereview.chromium.org/150203002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247955 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247954
SVN changes up to revision 247955