Remove non-const version of GetDefaultSearchProvider() and make all callers call the const version

chrome/browser/ui/search_engines/keyword_editor_controller.h

 // Copyright (c) 2012 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 CHROME_BROWSER_UI_SEARCH_ENGINES_KEYWORD_EDITOR_CONTROLLER_H_
 #define CHROME_BROWSER_UI_SEARCH_ENGINES_KEYWORD_EDITOR_CONTROLLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 30 matching lines @@
   // Return true if the given |url| can be made the default.
   bool CanMakeDefault(const TemplateURL* url) const;
 
   // Return true if the given |url| can be removed.
   bool CanRemove(const TemplateURL* url) const;
 
   // Remove the TemplateURL at the specified index in the TableModel.
   void RemoveTemplateURL(int index);
 
   // Returns the default search provider.
-  TemplateURL* GetDefaultSearchProvider();
+  const TemplateURL* GetDefaultSearchProvider();
 
   // Make the TemplateURL at the specified index (into the TableModel) the
   // default search provider.  Return the new index, or -1 if nothing was done.
   int MakeDefaultTemplateURL(int index);
 
   // Return true if the |url_model_| data is loaded.
   bool loaded() const;
 
   // Return the TemplateURL corresponding to the |index| in the model.
   TemplateURL* GetTemplateURL(int index);
 
   TemplateURLTableModel* table_model() {
     return table_model_.get();
   }
 
  private:
   TemplateURLService* url_model_;
 
   // Model for the TableView.
   std::unique_ptr<TemplateURLTableModel> table_model_;
 
   DISALLOW_COPY_AND_ASSIGN(KeywordEditorController);
 };
 
 #endif  // CHROME_BROWSER_UI_SEARCH_ENGINES_KEYWORD_EDITOR_CONTROLLER_H_