Move ExtensionSystem references out of ExtensionAppModelBuilder.

BUG=310376

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=232056

Review URL: https://codereview.chromium.org/52143002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232353 0039d316-1c4b-4281-b951-d872f2087c98
Start the experiment for the new Translate UX

BUG=307890

Review URL: https://codereview.chromium.org/52483003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232354 0039d316-1c4b-4281-b951-d872f2087c98
Adding UMA statistics for multi profile

We are capturing:
- The used multi profile mode
- Window teleports (and their type of transfer)

BUG=311828
TEST=visual using chrome://histograms page

Review URL: https://codereview.chromium.org/52713008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232355 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232354
Added Chrome restart after machine requisition step.

BUG=313300
TEST=manual

Review URL: https://codereview.chromium.org/52773002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232356 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232355
SVN changes up to revision 232356