Local omnibox treats navsuggest suggestions as queries.

chrome/browser/ui/search/instant_controller.cc

Index: chrome/browser/ui/search/instant_controller.cc
diff --git a/chrome/browser/ui/search/instant_controller.cc b/chrome/browser/ui/search/instant_controller.cc
index 83f1e345833a15ef85e88f0bd2df06d9dfbae3a5..ca83c42eab0f9e12ce5c630e27bf45182ce74b0e 100644
--- a/chrome/browser/ui/search/instant_controller.cc
+++ b/chrome/browser/ui/search/instant_controller.cc
@@ -572,8 +572,12 @@ void InstantController::HandleAutocompleteResults(
       result.type = UTF8ToUTF16(AutocompleteMatch::TypeToString(match->type));
       result.description = match->description;
       result.destination_url = UTF8ToUTF16(match->destination_url.spec());
-      if (from_search_provider)
+
+      // Setting the search_query field tells the Instant page to treat the
+      // suggestion as a query.
+      if (AutocompleteMatch::IsSearchType(match->type))
         result.search_query = match->contents;
+
       result.transition = match->transition;
       result.relevance = match->relevance;
       DVLOG(1) << "    " << result.relevance << " " << result.type << " "