Disabled xinput2 until edge cases can be fixed.

ui/events/devices/x11/device_data_manager_x11.cc

Index: ui/events/devices/x11/device_data_manager_x11.cc
diff --git a/ui/events/devices/x11/device_data_manager_x11.cc b/ui/events/devices/x11/device_data_manager_x11.cc
index a4d1566d008d8281ba8c7bc96e3a3a8b951dba9f..58962d0f4ef6e8b7a4df2d3c82794d565f14623b 100644
--- a/ui/events/devices/x11/device_data_manager_x11.cc
+++ b/ui/events/devices/x11/device_data_manager_x11.cc
@@ -772,6 +772,10 @@ void DeviceDataManagerX11::UpdateScrollClassDevice(
   DCHECK(deviceid >= 0 && deviceid < kMaxDeviceNum);
   ScrollInfo& info = scroll_data_[deviceid];
 
+  // TODO: xinput2 is disabled until edge cases are fixed.
+  // http://crbug.com/616308
+  return;
+
   bool legacy_scroll_available =
       (scroll_class_info->flags & XIScrollFlagNoEmulation) == 0;
   // If the device's highest resolution is lower than the resolution of xinput1