throw when registering a prototype for element that already has a prototype registered.
throw when registering a prototype for element that already has a prototype registered.

BrianLTJ/polymer,ktiedt/polymer,zxs0827/polymer,tjsavage/polymer,rafaelducati/polymer,cbmeeks/polymer,fjkfwz/polymer,kristianmandrup/polymer,yforrest/polymer,henrylee2cn/polymer,jscissr/polymer,thiagolucio/polymer,elkamel/polymer,Endika/polymer,codegist/polymer,exlerdesigns/polymer,kristianmandrup/polymer,tjsavage/polymer,carbono-io/polymer,simo97/polymer,HiWong/polymer,MartinsThiago/polymer,Endika/polymer,YOTOV-LIMITED/polymer,HiWong/polymer,BrianLTJ/polymer,jordanyaker/polymer,gronke/polymer,bright-sparks/polymer,filaraujo/polymer,dotDeeka/polymer,mgiuffrida/polymer,thiagolucio/polymer,Tudes/polymer,chimpinano/polymer,Endika/polymer,tjsavage/polymer,MartinMoizard/polymer,samccone/polymer,simonfan/polymer,paulballesty/polymer,ankurvr/polymer,mgiuffrida/polymer,MartinsThiago/polymer,samccone/polymer,gazal-k/polymer,simo97/polymer,ThiagoGarciaAlves/polymer,jordanyaker/polymer,dalong123/polymer,chimpinano/polymer,itnirmaan/polymer,itnirmaan/polymer,Zagorakiss/polymer,fjkfwz/polymer,ktiedt/polymer,elkamel/polymer,zebMcCorkle/polymer,youprofit/polymer,japacible/polymer,JeremybellEU/polymer,yangjae/polymer,tachyon1337/polymer,zxs0827/polymer,cbmeeks/polymer,cgvarela/polymer,simonfan/polymer,cgvarela/polymer,gronke/polymer,samccone/polymer,MartinMoizard/polymer,thiagolucio/polymer,studiowangfei/polymer,yforrest/polymer,JsonChiu/polymer,jpalomar/polymer,tekjava/polymer,Polymer/polymer,mauricionr/polymer,jpalomar/polymer,cgvarela/polymer,udhayam/polymer,TedaLIEz/polymer,jvkops/polymer,akintoey/polymer,fjkfwz/polymer,HiWong/polymer,ikeagold/polymer,Litor/polymer,Kabele/polymer,filaraujo/polymer,mgiuffrida/polymer,MetaMemoryT/polymer,yangjae/polymer,JeremybellEU/polymer,jvkops/polymer,vic/polymer,simonsoft/polymer,exlerdesigns/polymer,tekjava/polymer,cbmeeks/polymer,jpalomar/polymer,youprofit/polymer,Kabele/polymer,studiowangfei/polymer,codegist/polymer,brandonmowat/polymer,MetaMemoryT/polymer,Polymer/polymer,ThiagoGarciaAlves/polymer,leitzler/polymer,simonsoft/polymer,JeremybellEU/polymer,Tudes/polymer,YOTOV-LIMITED/polymer,TedaLIEz/polymer,itnirmaan/polymer,JsonChiu/polymer,chimpinano/polymer,exlerdesigns/polymer,jscissr/polymer,bright-sparks/polymer,M4gn4tor/polymer,tachyon1337/polymer,rafaelducati/polymer,filaraujo/polymer,gazal-k/polymer,ilovezy/polymer,YOTOV-LIMITED/polymer,kristianmandrup/polymer,brandonmowat/polymer,jvkops/polymer,paulballesty/polymer,akintoey/polymer,Litor/polymer,pacificIT/polymer,M4gn4tor/polymer,elkamel/polymer,pacificIT/polymer,Flip120/polymer,jordanyaker/polymer,jscissr/polymer,mauricionr/polymer,marcus7777/polymer,tekjava/polymer,MartinMoizard/polymer,udhayam/polymer,yforrest/polymer,gazal-k/polymer,Litor/polymer,BrianLTJ/polymer,ktiedt/polymer,sekiyaeiji/polymer,dotDeeka/polymer,sekiyaeiji/polymer,ikeagold/polymer,pacificIT/polymer,ikeagold/polymer,MartinsThiago/polymer,japacible/polymer,vic/polymer,gronke/polymer,ankurvr/polymer,henrylee2cn/polymer,jforge/polymer,zebMcCorkle/polymer,jforge/polymer,simonfan/polymer,akintoey/polymer,bright-sparks/polymer,simo97/polymer,dalong123/polymer,henrylee2cn/polymer,dalong123/polymer,Flip120/polymer,leitzler/polymer,zxs0827/polymer,carbono-io/polymer,marcus7777/polymer,carbono-io/polymer,Tudes/polymer,Zagorakiss/polymer,Polymer/polymer,ilovezy/polymer,udhayam/polymer