Validate hash_sha256 checksum on .crx update.

chrome/browser/extensions/test_extension_service.h

Index: chrome/browser/extensions/test_extension_service.h
diff --git a/chrome/browser/extensions/test_extension_service.h b/chrome/browser/extensions/test_extension_service.h
index e4409e357549c0f62546f235e98cb66f2f808d19..ce49b94878b332ae575875d9a2b7f4bec30a79bf 100644
--- a/chrome/browser/extensions/test_extension_service.h
+++ b/chrome/browser/extensions/test_extension_service.h
@@ -29,6 +29,12 @@ class TestExtensionService : public ExtensionServiceInterface {
                        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;