Don't suggest if the search term is a known title

Also tell the SearchEngine that we don't *need* the suggestion.  Some will
make it any way and we'll ignore it.  Cirrus will be able to save some time
by not building the suggestion.

Bug: 59666
Change-Id: Ifd5bafe25a715db9d44cf0fee2ba2607f6c270a2
Merge "Don't suggest if the search term is a known title"