Removes the image && video check to enable the IE11 fallback

[andrebonon]

#266

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for the commit author(s). If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
In order to pass this check, please resolve this problem and have the pull request author add another comment and the bot will run again.

[lincolnfrog]

@andrebonon This looks good, please sign the CLA (the issue is you used two different email addresses when doing these commits so you need to sign the CLA as your other email address or just create this change again) and I will merge.

[googlebot]

CLAs look good, thanks!

[andrebonon]

@lincolnfrog, done!