[bindings] Pass v8::Local<v8::Value> by value in NativeValueTraits<T>::nativeValue()

Source/bindings/tests/results/core/V8TestInterfaceEventInit.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!
 
 #include "config.h"
 #include "V8TestInterfaceEventInit.h"
 
 #include "bindings/core/v8/ExceptionState.h"
@@ skipping 41 matching lines @@
 }
 
 void toV8TestInterfaceEventInit(const TestInterfaceEventInit& impl, v8::Local<v8::Object> dictionary, v8::Local<v8::Object> creationContext, v8::Isolate* isolate)
 {
     if (impl.hasStringMember()) {
         dictionary->Set(v8String(isolate, "stringMember"), v8String(isolate, impl.stringMember()));
     }
 
 }
 
-TestInterfaceEventInit NativeValueTraits<TestInterfaceEventInit>::nativeValue(const v8::Local<v8::Value>& value, v8::Isolate* isolate, ExceptionState& exceptionState)
+TestInterfaceEventInit NativeValueTraits<TestInterfaceEventInit>::nativeValue(v8::Local<v8::Value> value, v8::Isolate* isolate, ExceptionState& exceptionState)
 {
     TestInterfaceEventInit impl;
     V8TestInterfaceEventInit::toImpl(isolate, value, impl, exceptionState);
     return impl;
 }
 
 } // namespace blink