Assume all providers may give zero suggest responses.

components/omnibox/autocomplete_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 "components/omnibox/autocomplete_provider.h"
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/omnibox/autocomplete_input.h"
 #include "components/omnibox/autocomplete_match.h"
@@ skipping 31 matching lines @@
     default:
       NOTREACHED() << "Unhandled AutocompleteProvider::Type " << type;
       return "Unknown";
   }
 }
 
 void AutocompleteProvider::Stop(bool clear_cached_results) {
   done_ = true;
 }
 
-bool AutocompleteProvider::ProvidesMatchesOnOmniboxFocus() const {
-  return false;
-}
-
 const char* AutocompleteProvider::GetName() const {
   return TypeToString(type_);
 }
 
 metrics::OmniboxEventProto_ProviderType AutocompleteProvider::
     AsOmniboxEventProviderType() const {
   switch (type_) {
     case TYPE_BOOKMARK:
       return metrics::OmniboxEventProto::BOOKMARK;
     case TYPE_BUILTIN:
@@ skipping 114 matching lines @@
   DCHECK_NE(base::string16::npos, scheme_pos);
 
   // Erase scheme plus up to two slashes.
   size_t prefix_end = scheme_pos + strlen(url::kHttpScheme) + 1;
   const size_t after_slashes = std::min(url->length(), prefix_end + 2);
   while ((prefix_end < after_slashes) && ((*url)[prefix_end] == '/'))
     ++prefix_end;
   url->erase(scheme_pos, prefix_end - scheme_pos);
   return (scheme_pos == 0) ? prefix_end : 0;
 }