Fix test in Firefox that was hacked to work in Canary (instead filed https://bugs.chromium.org/p/chromium/issues/detail?id=614198).
Fix test in Firefox that was hacked to work in Canary (instead filed https://bugs.chromium.org/p/chromium/issues/detail?id=614198).

ktiedt/polymer,ikeagold/polymer,Polymer/polymer,JeremybellEU/polymer,yforrest/polymer,ktiedt/polymer,jordanyaker/polymer,MartinsThiago/polymer,mgiuffrida/polymer,ikeagold/polymer,JeremybellEU/polymer,Polymer/polymer,yforrest/polymer,ikeagold/polymer,ktiedt/polymer,yforrest/polymer,mgiuffrida/polymer,gronke/polymer,JeremybellEU/polymer,mgiuffrida/polymer,gronke/polymer,MartinsThiago/polymer,gronke/polymer,Polymer/polymer,MartinsThiago/polymer,jordanyaker/polymer,jordanyaker/polymer