Avoid DCHECK failure for chrome:// URLs in autocomplete suggestions

components/omnibox/browser/physical_web_provider.h

 // Copyright (c) 2016 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.
 
 #ifndef COMPONENTS_OMNIBOX_BROWSER_PHYSICAL_WEB_PROVIDER_H_
 #define COMPONENTS_OMNIBOX_BROWSER_PHYSICAL_WEB_PROVIDER_H_
 
 #include "components/omnibox/browser/autocomplete_input.h"
 #include "components/omnibox/browser/autocomplete_provider.h"
 
 class AutocompleteProviderClient;
+class HistoryURLProvider;
 
 namespace base {
 class ListValue;
 }
 
 class PhysicalWebProvider : public AutocompleteProvider {
 public:
-  static PhysicalWebProvider* Create(AutocompleteProviderClient* client);
+  static PhysicalWebProvider* Create(AutocompleteProviderClient* client,
+                                     HistoryURLProvider* history_url_provider);
 
   // AutocompleteProvider:
   void Start(const AutocompleteInput& input, bool minimal_changes) override;
   void Stop(bool clear_cached_results, bool due_to_user_inactivity) override;
 
 private:
-  PhysicalWebProvider(AutocompleteProviderClient* client);
+  PhysicalWebProvider(AutocompleteProviderClient* client,
+                      HistoryURLProvider* history_url_provider);
   ~PhysicalWebProvider() override;
 
   // Adds a separate match item to |matches_| for each nearby URL in
   // |metadata_list|, up to the maximum number of matches allowed. If the total
   // number of nearby URLs exceeds this limit, one match is used for an overflow
   // item.
   void ConstructMatches(base::ListValue* metadata_list);
 
   // Adds an overflow match item to |matches_| with a relevance score equal to
   // |relevance| and a label indicating there are |additional_url_count| more
   // nearby URLs. Selecting the overflow item navigates to the Physical Web
   // WebUI, which displays the full list of nearby URLs.
   void AppendOverflowItem(int additional_url_count, int relevance);
 
   AutocompleteProviderClient* client_;
+
+  // Used for efficiency when creating the verbatim match.  Can be NULL.
+  HistoryURLProvider* history_url_provider_;
 };
 
 #endif  // COMPONENTS_OMNIBOX_BROWSER_PHYSICAL_WEB_PROVIDER_H_