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The only client of InMemoryURLIndex::HistoryItemsForTerms is
//chrome/browser/autocomplete/history_quick_provider.cc which has access
to the constant. So pass the constant to the history component instead
of having the dependency.

BUG=374730
TBR=thakis  // For OWNERS at chrome/browser/autocomplete/history_quick_provider.cc

Review URL: https://codereview.chromium.org/296743009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273072 0039d316-1c4b-4281-b951-d872f2087c98