bindings: Fix coding style in SequenceTest.

third_party/WebKit/Source/core/testing/SequenceTest.cpp

 // Copyright 2017 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.
 
 #include "SequenceTest.h"
 
 namespace blink {
 
 SequenceTest::SequenceTest() {}
 
@@ skipping 18 matching lines @@
     const Vector<int32_t>& arg) const {
   return arg;
 }
 
 Nullable<Vector<uint8_t>> SequenceTest::identityOctetSequenceOrNull(
     const Nullable<Vector<uint8_t>>& arg) const {
   return arg;
 }
 
 HeapVector<Member<Element>> SequenceTest::getElementSequence() const {
-  return m_elementSequence;
+  return element_sequence_;
 }
 
 void SequenceTest::setElementSequence(const HeapVector<Member<Element>>& arg) {
-  m_elementSequence = arg;
+  element_sequence_ = arg;
 }
 
 bool SequenceTest::unionReceivedSequence(const DoubleOrDoubleSequence& arg) {
   return arg.isDoubleSequence();
 }
 
 DEFINE_TRACE(SequenceTest) {
-  visitor->Trace(m_elementSequence);
+  visitor->Trace(element_sequence_);
 }
 
 }  // namespace blink