Get and return String by const-ref if used as rvalue

third_party/WebKit/Source/bindings/tests/results/modules/BooleanOrString.cpp

 // Copyright 2014 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.
 
 // This file has been auto-generated by code_generator_v8.py.
 // DO NOT MODIFY!
 
 // This file has been generated from the Jinja2 template in
 // third_party/WebKit/Source/bindings/templates/union_container.cpp.tmpl
 
@@ skipping 18 matching lines @@
   m_boolean = value;
   m_type = SpecificTypeBoolean;
 }
 
 BooleanOrString BooleanOrString::fromBoolean(bool value) {
   BooleanOrString container;
   container.setBoolean(value);
   return container;
 }
 
-String BooleanOrString::getAsString() const {
+const String& BooleanOrString::getAsString() const {
   DCHECK(isString());
   return m_string;
 }
 
-void BooleanOrString::setString(String value) {
+void BooleanOrString::setString(const String& value) {
   DCHECK(isNull());
   m_string = value;
   m_type = SpecificTypeString;
 }
 
-BooleanOrString BooleanOrString::fromString(String value) {
+BooleanOrString BooleanOrString::fromString(const String& value) {
   BooleanOrString container;
   container.setString(value);
   return container;
 }
 
 BooleanOrString::BooleanOrString(const BooleanOrString&) = default;
 BooleanOrString::~BooleanOrString() = default;
 BooleanOrString& BooleanOrString::operator=(const BooleanOrString&) = default;
 
 DEFINE_TRACE(BooleanOrString) {
@@ skipping 34 matching lines @@
   return v8::Local<v8::Value>();
 }
 
 BooleanOrString NativeValueTraits<BooleanOrString>::NativeValue(v8::Isolate* isolate, v8::Local<v8::Value> value, ExceptionState& exceptionState) {
   BooleanOrString impl;
   V8BooleanOrString::toImpl(isolate, value, impl, UnionTypeConversionMode::kNotNullable, exceptionState);
   return impl;
 }
 
 }  // namespace blink