Remove the deprecated function ExtensionService::extensions().

chrome/browser/extensions/test_extension_service.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_EXTENSIONS_TEST_EXTENSION_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_TEST_EXTENSION_SERVICE_H_
 
 #include <string>
 #include <vector>
 
 #include "chrome/browser/extensions/extension_service.h"
 
 namespace extensions {
 class CrxInstaller;
 class Extension;
 }
 
 // Implemention of ExtensionServiceInterface with default
 // implementations for methods that add failures.  You should subclass
 // this and override the methods you care about.
 class TestExtensionService : public ExtensionServiceInterface {
  public:
   ~TestExtensionService() override;
 
   // ExtensionServiceInterface implementation.
-  const extensions::ExtensionSet* extensions() const override;
   extensions::PendingExtensionManager* pending_extension_manager() override;
 
   bool UpdateExtension(const std::string& id,
                        const base::FilePath& path,
                        bool file_ownership_passed,
                        extensions::CrxInstaller** out_crx_installer) override;
   const extensions::Extension* GetExtensionById(
       const std::string& id,
       bool include_disabled) const override;
   const extensions::Extension* GetInstalledExtension(
@@ skipping 13 matching lines @@
   void AddExtension(const extensions::Extension* extension) override;
   void AddComponentExtension(const extensions::Extension* extension) override;
 
   void UnloadExtension(
       const std::string& extension_id,
       extensions::UnloadedExtensionInfo::Reason reason) override;
   void RemoveComponentExtension(const std::string& extension_id) override;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_TEST_EXTENSION_SERVICE_H_