Fix new build break on Windows with OpenVR.

device/vr/openvr/openvr_gamepad_data_fetcher.cc

Index: device/vr/openvr/openvr_gamepad_data_fetcher.cc
diff --git a/device/vr/openvr/openvr_gamepad_data_fetcher.cc b/device/vr/openvr/openvr_gamepad_data_fetcher.cc
index d165b442fce6de9bf165e1106975e3fffd5bec16..cccdb372909344a39df9e708d42f247d3ecd28fa 100644
--- a/device/vr/openvr/openvr_gamepad_data_fetcher.cc
+++ b/device/vr/openvr/openvr_gamepad_data_fetcher.cc
@@ -195,10 +195,10 @@ void OpenVRGamepadDataFetcher::GetGamepadData(bool devices_changed_hint) {
       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];