Omnibox: Fix Crash by Setting Provider Type for SearchTermReplacement Queries
Test:
1. run chrome with a metrics enabled and with force-fieldtrials to
get into a search-term-replacement group
2. enter a query, hit return
3. on the search results page, click in the omnibox and press
return again (no typing), this reissuing the query while keeping
the omnibox closed.
4. before this change, the browser would crash. now it does not.
BUG=370119
Review URL: https://codereview.chromium.org/
288073002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@270879 0039d316-1c4b-4281-b951-d872f2087c98