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If I type an exact query that I issued before, SearchProvider shouldn't
offer an extension to the autocompletion, even if that I issued that longer
query more recently.  This is counter to user's expectations: if I issued
the query before and type it again and hit enter, I should get that query.

I do not plan to bother running an experiment for this change.

BUG=246411

Review URL: https://codereview.chromium.org/397723003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283836 0039d316-1c4b-4281-b951-d872f2087c98