Assume all providers may give zero suggest responses.

components/omnibox/autocomplete_provider.cc

Index: components/omnibox/autocomplete_provider.cc
diff --git a/components/omnibox/autocomplete_provider.cc b/components/omnibox/autocomplete_provider.cc
index 60d87bd57bc7b52ea6f923b49c2b5d05a7432a0c..9238eab557dba1220d9bd363f40692906943081a 100644
--- a/components/omnibox/autocomplete_provider.cc
+++ b/components/omnibox/autocomplete_provider.cc
@@ -49,10 +49,6 @@ void AutocompleteProvider::Stop(bool clear_cached_results) {
   done_ = true;
 }
 
-bool AutocompleteProvider::ProvidesMatchesOnOmniboxFocus() const {
-  return false;
-}
-
 const char* AutocompleteProvider::GetName() const {
   return TypeToString(type_);
 }