GitLab

This change deletes the browser-side InstantController code pertaining
to old Instant, the HTML popup and search results overlay. A lot of UI
and renderer code is still lingering and doing nothing, but I'll get
that in another CL.

TEST=Manually. Verify that InstantExtended NTP and searching works, and
that normal Chrome is unaffected.
BUG=251262
TBR=samarth@chromium.org,pkasting@chromium.org,brettw@chromium.org

Review URL: https://codereview.chromium.org/18516011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@210062 0039d316-1c4b-4281-b951-d872f2087c98