Fix new build break on Windows with OpenVR.

device/vr/openvr/openvr_gamepad_data_fetcher.cc

 // 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 "device/vr/openvr/openvr_gamepad_data_fetcher.h"
 
 #include <memory>
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 177 matching lines @@
       const vr::HmdMatrix34_t& mat = pose.mDeviceToAbsoluteTracking;
       gfx::Transform transform(
           mat.m[0][0], mat.m[0][1], mat.m[0][2], mat.m[0][3], mat.m[1][0],
           mat.m[1][1], mat.m[1][2], mat.m[1][3], mat.m[2][0], mat.m[2][1],
           mat.m[2][2], mat.m[2][3], 0, 0, 0, 1);
 
       gfx::DecomposedTransform decomposed_transform;
       gfx::DecomposeTransform(&decomposed_transform, transform);
 
       pad.pose.orientation.not_null = true;
-      pad.pose.orientation.x = decomposed_transform.quaternion[0];
-      pad.pose.orientation.y = decomposed_transform.quaternion[1];
-      pad.pose.orientation.z = decomposed_transform.quaternion[2];
-      pad.pose.orientation.w = decomposed_transform.quaternion[3];
+      pad.pose.orientation.x = decomposed_transform.quaternion.x();
+      pad.pose.orientation.y = decomposed_transform.quaternion.y();
+      pad.pose.orientation.z = decomposed_transform.quaternion.z();
+      pad.pose.orientation.w = decomposed_transform.quaternion.w();
 
       pad.pose.position.not_null = true;
       pad.pose.position.x = decomposed_transform.translate[0];
       pad.pose.position.y = decomposed_transform.translate[1];
       pad.pose.position.z = decomposed_transform.translate[2];
 
       pad.pose.angular_velocity.not_null = true;
       pad.pose.angular_velocity.x = pose.vAngularVelocity.v[0];
       pad.pose.angular_velocity.y = pose.vAngularVelocity.v[1];
       pad.pose.angular_velocity.z = pose.vAngularVelocity.v[2];
 
       pad.pose.linear_velocity.not_null = true;
       pad.pose.linear_velocity.x = pose.vVelocity.v[0];
       pad.pose.linear_velocity.y = pose.vVelocity.v[1];
       pad.pose.linear_velocity.z = pose.vVelocity.v[2];
     } else {
       pad.pose.orientation.not_null = false;
       pad.pose.position.not_null = false;
       pad.pose.angular_velocity.not_null = false;
       pad.pose.linear_velocity.not_null = false;
     }
   }
 }
 
 void OpenVRGamepadDataFetcher::PauseHint(bool paused) {}
 
 }  // namespace device