[bindings] Let NativeValueTraits<T>::nativeValue be variadic function and merge various convers…

Source/bindings/core/v8/ScriptValue.h

Index: Source/bindings/core/v8/ScriptValue.h
diff --git a/Source/bindings/core/v8/ScriptValue.h b/Source/bindings/core/v8/ScriptValue.h
index 4a727dd732a30cdab4624dc4af2e5e6e06244db8..08e079e129f1284b4eca5d07db359b54464de45a 100644
--- a/Source/bindings/core/v8/ScriptValue.h
+++ b/Source/bindings/core/v8/ScriptValue.h
@@ -52,10 +52,16 @@ public:
         return ScriptValue(scriptState, toV8(value, scriptState->context()->Global(), scriptState->isolate()));
     }
 
-    template<typename T>
-    inline T to(ExceptionState& exceptionState) const
+    template<typename T, typename... Arguments>
+    static inline T to(v8::Isolate* isolate, v8::Local<v8::Value> value, ExceptionState& exceptionState, Arguments... arguments)
+    {
+        return NativeValueTraits<T>::nativeValue(value, isolate, exceptionState, arguments...);
+    }
+
+    template<typename T, typename... Arguments>
+    static inline T to(v8::Isolate* isolate, const ScriptValue& value, ExceptionState& exceptionState, Arguments... arguments)
     {
-        return NativeValueTraits<T>::nativeValue(v8Value(), isolate(), exceptionState);
+        return to<T>(isolate, value.v8Value(), exceptionState, arguments...);
     }
 
     ScriptValue() { }
@@ -153,7 +159,6 @@ public:
     v8::Handle<v8::Value> v8ValueUnsafe() const;
 
     bool toString(String&) const;
-    PassRefPtr<JSONValue> toJSONValue(ScriptState*) const;
 
     static ScriptValue createNull(ScriptState*);