Assume all providers may give zero suggest responses.

athena/extensions/shell/url_search_provider.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "athena/extensions/shell/url_search_provider.h"
 
 #include "athena/activity/public/activity.h"
 #include "athena/activity/public/activity_factory.h"
 #include "athena/extensions/shell/athena_shell_scheme_classifier.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 235 matching lines @@
     // TODO(hashimoto): Componentize HistoryURLProvider and remove this code.
     AutocompleteMatch what_you_typed_match(
         nullptr, 0, false, AutocompleteMatchType::URL_WHAT_YOU_TYPED);
     what_you_typed_match.destination_url = input_.canonicalized_url();
     what_you_typed_match.contents = input_.text();
     what_you_typed_match.relevance = kScoreForWhatYouTypedResult;
     Add(scoped_ptr<app_list::SearchResult>(
         new UrlSearchResult(browser_context_, what_you_typed_match)));
   }
 
-  provider_->Start(input_, minimal_changes);
+  provider_->Start(input_, minimal_changes, false);
 }
 
 void UrlSearchProvider::Stop() {
   provider_->Stop(false);
 }
 
 void UrlSearchProvider::OnProviderUpdate(bool updated_matches) {
   if (!updated_matches)
     return;
 
   const ACMatches& matches = provider_->matches();
   for (ACMatches::const_iterator it = matches.begin(); it != matches.end();
        ++it) {
     if (!it->destination_url.is_valid())
       continue;
 
     Add(scoped_ptr<app_list::SearchResult>(
         new UrlSearchResult(browser_context_, *it)));
   }
 }
 
 }  // namespace athena