Drop [TypeChecking=Nullable]; deduce from attribute type instead

Source/bindings/tests/results/V8TestInterfaceEventConstructor.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 "V8TestInterfaceEventConstructor.h"
 
 #include "bindings/core/v8/custom/V8Uint8ArrayCustom.h"
@@ skipping 161 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("blink", "DOMGetter");
     TestInterfaceEventConstructorV8Internal::initializedByEventConstructorReadonlyTestInterfaceEmptyArrayAttributeAttributeGetter(info);
     TRACE_EVENT_SET_SAMPLING_STATE("v8", "V8Execution");
 }
 
 static void initializedByEventConstructorReadonlyNullableTestInterfaceEmptyAttributeAttributeGetter(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     v8::Handle<v8::Object> holder = info.Holder();
     TestInterfaceEventConstructor* impl = V8TestInterfaceEventConstructor::toNative(holder);
-    bool isNull = false;
-    RefPtr<TestInterfaceEmpty> cppValue(impl->initializedByEventConstructorReadonlyNullableTestInterfaceEmptyAttribute(isNull));
-    if (isNull) {
+    RefPtr<TestInterfaceEmpty> cppValue(impl->initializedByEventConstructorReadonlyNullableTestInterfaceEmptyAttribute());
+    if (!cppValue) {
         v8SetReturnValueNull(info);
         return;
     }
     if (cppValue && DOMDataStore::setReturnValueFromWrapper<V8TestInterfaceEmpty>(info.GetReturnValue(), cppValue.get()))
         return;
     v8::Handle<v8::Value> wrapper = toV8(cppValue.get(), holder, info.GetIsolate());
     if (!wrapper.IsEmpty()) {
         V8HiddenValue::setHiddenValue(info.GetIsolate(), holder, v8AtomicString(info.GetIsolate(), "initializedByEventConstructorReadonlyNullableTestInterfaceEmptyAttribute"), wrapper);
         v8SetReturnValue(info, wrapper);
     }
@@ skipping 229 matching lines @@
 #endif // !ENABLE(OILPAN)
 }
 
 template<>
 v8::Handle<v8::Value> toV8NoInline(TestInterfaceEventConstructor* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     return toV8(impl, creationContext, isolate);
 }
 
 } // namespace WebCore