Validate hash_sha256 checksum on .crx update.

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>
 
@@ skipping 11 matching lines @@
  public:
   ~TestExtensionService() override;
 
   // ExtensionServiceInterface implementation.
   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;
+  bool CheckAndUpdateExtension(
+      const std::string& id,
+      const base::FilePath& path,
+      const std::string& hash,
+      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(
       const std::string& id) const override;
   const extensions::Extension* GetPendingExtensionUpdate(
       const std::string& extension_id) const override;
   void FinishDelayedInstallation(const std::string& extension_id) override;
   bool IsExtensionEnabled(const std::string& extension_id) const override;
 
   void CheckManagementPolicy() override;
   void CheckForUpdatesSoon() override;
 
   bool is_ready() override;
 
   base::SequencedTaskRunner* GetFileTaskRunner() override;
 
   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_