Implement forwarding of search queries for metro mode
If chrome is the default browser, launch from the search charm does not
use the delegate_execute so if desktop chrome is running, metro chrome
needs to forward the search string and quickly quite
The source of complexity here is that to form the full url, chrome needs
to access the profile which cannot be done from the metro chrome since
the desktop chrome has the profile locked.
Instead we leveage the kMetroNavigationAndSearchMessage from the singleton
code.
BUG=141032
TEST= see bug
Review URL: https://chromiumcodereview.appspot.com/
10824387
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152818 0039d316-1c4b-4281-b951-d872f2087c98