Move DeviceType valuesArray to constructor
Move DeviceType valuesArray to constructor

classProperties is not enabled for Polymer compiler

See: https://github.com/Polymer/tools/issues/3360
Bug: 137847631
Change-Id: Iae68919462765e9672539fbc68c14fa9818ea163

actions-on-google/smart-home-frontend,actions-on-google/smart-home-frontend