Munge descriptions of search matches even when they come from the shortcuts
provider.
The shortcuts backend will still end up storing inconsistent descriptions --
e.g. "Google Search" or the empty string, depending on which line the user
opens -- but it won't matter, because these will all get reset consistently when
the controller displays them.
BUG=320060
TEST=none
R=mpearson@chromium.org
Review URL: https://codereview.chromium.org/
205383007
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@259638 0039d316-1c4b-4281-b951-d872f2087c98