InstantExtended: remove old flags, add new flag for query extraction.
This change does three things:
(1) Remove flags for Instant Extended. Instant Extended is now always on.
(2) Add a separate flag to control query extraction. Also rename
suppress_on_srp to query_extraction to make its purpose clearer.
(3) Assorted cleanup resulting from (1) and (2).
Note that a lot more code (especially in search.cc) can be cleaned up and I
will address that in follow up changes. Attempting to keep this from
snowballing into a huge CL.
BUG=297915
Review URL: https://codereview.chromium.org/73613002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236116 0039d316-1c4b-4281-b951-d872f2087c98
28 files changed
