[bindings] Refactor NativeValueTraits<T>::nativeValue to accept isolate as first parameter.

Source/bindings/templates/union.cpp

Index: Source/bindings/templates/union.cpp
diff --git a/Source/bindings/templates/union.cpp b/Source/bindings/templates/union.cpp
index 73c466f0f45d814eb9ac56aa3206aca75b403a5e..65106e5342cfc0230f46af2a63992a1f8a57845d 100644
--- a/Source/bindings/templates/union.cpp
+++ b/Source/bindings/templates/union.cpp
@@ -184,7 +184,7 @@ v8::Local<v8::Value> toV8(const {{container.cpp_class}}& impl, v8::Local<v8::Obj
     return v8::Local<v8::Value>();
 }
 
-{{container.cpp_class}} NativeValueTraits<{{container.cpp_class}}>::nativeValue(v8::Local<v8::Value> value, v8::Isolate* isolate, ExceptionState& exceptionState)
+{{container.cpp_class}} NativeValueTraits<{{container.cpp_class}}>::nativeValue(v8::Isolate* isolate, v8::Local<v8::Value> value, ExceptionState& exceptionState)
 {
     {{container.cpp_class}} impl;
     V8{{container.cpp_class}}::toImpl(isolate, value, impl, exceptionState);