Convert //extensions/browser/api from scoped_ptr to std::unique_ptr

extensions/browser/api/execute_code_function.cc

Index: extensions/browser/api/execute_code_function.cc
diff --git a/extensions/browser/api/execute_code_function.cc b/extensions/browser/api/execute_code_function.cc
index 53fcb44a47eba877af1de2b3987a6fcd3615106a..9571a0dcb7b3867d5ac4f702316be10fab2f2e5c 100644
--- a/extensions/browser/api/execute_code_function.cc
+++ b/extensions/browser/api/execute_code_function.cc
@@ -84,7 +84,7 @@ void ExecuteCodeFunction::GetFileURLAndLocalizeCSS(
   // Check if the file is CSS and needs localization.
   if ((script_type == ScriptExecutor::CSS) && !extension_id.empty() &&
       (data.find(MessageBundle::kMessageBegin) != std::string::npos)) {
-    scoped_ptr<SubstitutionMap> localization_messages(
+    std::unique_ptr<SubstitutionMap> localization_messages(
         file_util::LoadMessageBundleSubstitutionMap(
             extension_path, extension_id, extension_default_locale));