Remove HTML5 shim for <IE9
Remove HTML5 shim for <IE9

IE8 and below are officially no longer supported. The shim only loaded
in IE8 and below, and so it can be removed without affecting supported
browsers.

Review: http://reviews.apache.org/r/13005

craimbert/mesos,craimbert/mesos,chhsia0/mesos,neilconway/mesos,abudnik/mesos,reneploetz/mesos,yuquanshan/customizedMesos,abudnik/mesos,dforsyth/mesos,yuquanshan/customizedMesos,yuquanshan/customizedMesos,kaysoky/mesos,Gilbert88/mesos,zmalik/mesos,yuquanshan/customizedMesos,Aman-Jain-14/customizedMesos,yuquanshan/customizedMesos,asamerh4/mesos,jpeach/mesos,neilconway/mesos,chhsia0/mesos,dforsyth/mesos,asamerh4/mesos,Gilbert88/mesos,dforsyth/mesos,kaysoky/mesos,verizonlabs/mesos,chhsia0/mesos,chhsia0/mesos,zmalik/mesos,zmalik/mesos,gsantovena/mesos,zmalik/mesos,zmalik/mesos,jpeach/mesos,andschwa/mesos,yuquanshan/customizedMesos,verizonlabs/mesos,dforsyth/mesos,jpeach/mesos,yuquanshan/customizedMesos,zmalik/mesos,abudnik/mesos,Gilbert88/mesos,kaysoky/mesos,craimbert/mesos,zmalik/mesos,reneploetz/mesos,Aman-Jain-14/customizedMesos,Aman-Jain-14/customizedMesos,neilconway/mesos,gsantovena/mesos,andschwa/mesos,andschwa/mesos,craimbert/mesos,reneploetz/mesos,Aman-Jain-14/customizedMesos,asamerh4/mesos,asamerh4/mesos,gsantovena/mesos,andschwa/mesos,asamerh4/mesos,gsantovena/mesos,abudnik/mesos,Aman-Jain-14/customizedMesos,verizonlabs/mesos,gsantovena/mesos,neilconway/mesos,abudnik/mesos,verizonlabs/mesos,reneploetz/mesos,craimbert/mesos,neilconway/mesos,chhsia0/mesos,dforsyth/mesos,Aman-Jain-14/customizedMesos,neilconway/mesos,jpeach/mesos,Gilbert88/mesos,kaysoky/mesos,andschwa/mesos,Aman-Jain-14/customizedMesos,Gilbert88/mesos,kaysoky/mesos,reneploetz/mesos,jpeach/mesos,dforsyth/mesos,abudnik/mesos,verizonlabs/mesos,chhsia0/mesos,kaysoky/mesos,dforsyth/mesos,verizonlabs/mesos,craimbert/mesos,andschwa/mesos,reneploetz/mesos,neilconway/mesos,kaysoky/mesos,jpeach/mesos,asamerh4/mesos,gsantovena/mesos,Gilbert88/mesos,reneploetz/mesos,jpeach/mesos,craimbert/mesos,abudnik/mesos,chhsia0/mesos,Gilbert88/mesos,asamerh4/mesos,gsantovena/mesos,verizonlabs/mesos,andschwa/mesos