bindings: Make the sequence conversion code more complaint with WebIDL.

third_party/WebKit/Source/bindings/tests/results/core/StringSequenceCallbackFunctionLongSequenceArg.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/callback_function.cpp.tmpl
 
@@ skipping 60 matching lines @@
   v8::Local<v8::Value> v8ReturnValue;
   if (!V8ScriptRunner::CallFunction(m_callback.NewLocal(isolate),
                                     context,
                                     thisValue,
                                     1,
                                     argv,
                                     isolate).ToLocal(&v8ReturnValue)) {
     return false;
   }
 
-  Vector<String> cppValue = ToImplArray<Vector<String>>(v8ReturnValue, 0, m_scriptState->GetIsolate(), exceptionState);
+  Vector<String> cppValue = NativeValueTraits<IDLSequence<IDLString>>::NativeValue(m_scriptState->GetIsolate(), v8ReturnValue, exceptionState);
   if (exceptionState.HadException())
     return false;
   returnValue = cppValue;
   return true;
 }
 
 StringSequenceCallbackFunctionLongSequenceArg* NativeValueTraits<StringSequenceCallbackFunctionLongSequenceArg>::NativeValue(v8::Isolate* isolate, v8::Local<v8::Value> value, ExceptionState& exceptionState) {
   StringSequenceCallbackFunctionLongSequenceArg* nativeValue = StringSequenceCallbackFunctionLongSequenceArg::Create(ScriptState::Current(isolate), value);
   if (!nativeValue) {
     exceptionState.ThrowTypeError(ExceptionMessages::FailedToConvertJSValue(
         "StringSequenceCallbackFunctionLongSequenceArg"));
   }
   return nativeValue;
 }
 
 }  // namespace blink