Remove globalSearch argument from triggerSearch()

API council says:

"In reviewing the new triggerSearch API, we are concerned that
applications could use the option to perform a global search to spam
the user with frequent searches.  We would like the global search
option to be removed for now (not just hidden, but removed from the
internal IPC API so that nobody can find this and abuse it).  The rest
of the API should be fine as long as it is restricted to local
searches."

Fixes http://b/editIssue?id=2158785

Change-Id: Ie69a9c0ab6373cc4427aab50606885bdede40585