WTF/std normalization: replace WTF::Vector::first() with ::front()

third_party/WebKit/Source/modules/vr/VRPose.cpp

 // Copyright 2015 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 "modules/vr/VRPose.h"
 
 namespace blink {
 
 namespace {
 
 DOMFloat32Array* mojoArrayToFloat32Array(
     const WTF::Optional<WTF::Vector<float>>& vec) {
   if (!vec)
     return nullptr;
 
-  return DOMFloat32Array::create(&(vec.value().first()), vec.value().size());
+  return DOMFloat32Array::create(&(vec.value().front()), vec.value().size());
 }
 
 }  // namespace
 
 VRPose::VRPose() {}
 
 void VRPose::setPose(const device::mojom::blink::VRPosePtr& state) {
   if (state.is_null())
     return;
 
   m_orientation = mojoArrayToFloat32Array(state->orientation);
   m_position = mojoArrayToFloat32Array(state->position);
   m_angularVelocity = mojoArrayToFloat32Array(state->angularVelocity);
   m_linearVelocity = mojoArrayToFloat32Array(state->linearVelocity);
   m_angularAcceleration = mojoArrayToFloat32Array(state->angularAcceleration);
   m_linearAcceleration = mojoArrayToFloat32Array(state->linearAcceleration);
 }
 
 DEFINE_TRACE(VRPose) {
   visitor->trace(m_orientation);
   visitor->trace(m_position);
   visitor->trace(m_angularVelocity);
   visitor->trace(m_linearVelocity);
   visitor->trace(m_angularAcceleration);
   visitor->trace(m_linearAcceleration);
 }
 
 }  // namespace blink