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

third_party/WebKit/Source/bindings/tests/results/core/BooleanOrElementSequence.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/union_container.cpp.tmpl
 
@@ skipping 56 matching lines @@
   visitor->Trace(m_elementSequence);
 }
 
 void V8BooleanOrElementSequence::toImpl(v8::Isolate* isolate, v8::Local<v8::Value> v8Value, BooleanOrElementSequence& impl, UnionTypeConversionMode conversionMode, ExceptionState& exceptionState) {
   if (v8Value.IsEmpty())
     return;
 
   if (conversionMode == UnionTypeConversionMode::kNullable && IsUndefinedOrNull(v8Value))
     return;
 
-  if (v8Value->IsArray()) {
-    HeapVector<Member<Element>> cppValue = ToMemberNativeArray<Element>(v8Value, 0, isolate, exceptionState);
+  if (IsV8Sequence(isolate, v8Value, exceptionState)) {
+    HeapVector<Member<Element>> cppValue = NativeValueTraits<IDLSequence<Element>>::NativeValue(isolate, v8Value, exceptionState);
     if (exceptionState.HadException())
       return;
     impl.setElementSequence(cppValue);
     return;
   }
 
   if (v8Value->IsBoolean()) {
     impl.setBoolean(v8Value.As<v8::Boolean>()->Value());
     return;
   }
@@ skipping 18 matching lines @@
   return v8::Local<v8::Value>();
 }
 
 BooleanOrElementSequence NativeValueTraits<BooleanOrElementSequence>::NativeValue(v8::Isolate* isolate, v8::Local<v8::Value> value, ExceptionState& exceptionState) {
   BooleanOrElementSequence impl;
   V8BooleanOrElementSequence::toImpl(isolate, value, impl, UnionTypeConversionMode::kNotNullable, exceptionState);
   return impl;
 }
 
 }  // namespace blink