Delete obsolete line

Fix ampproject#3788

Fix xhr.assertSuccess promise (ampproject#3737)

* Fix xhr.assertSuccess promise.

* dont create another promise instance.

Update doc for Facebook amp-social-share. Correct attributes (ampproj…

…ect#3720)

add private properties of base-element to amp.extern (ampproject#3628)

Do not obfuscated uppercase names. (ampproject#3590)

This is too aggressive while we don't have proper externs.

Fixes ampproject#3588 although no Criteo ad is showing.

fix(csi): wait until messaging channel is established before flushing (…

…ampproject#3580)

fix shorthand lint error (ampproject#3532)

chore(package): update jsdom to version 9.2.1 (ampproject#3374)

Reset border-top for iOS in lightbox mode (ampproject#3407)

Fixing hidden infinite loop in the build pending and attach cycle (am…

…pproject#3355)

* Only do the build resource loop if we are not already in one.

* Add tests

* outside the loop set flag.

* Protect with try-catch.

* cleanup

* build new resource test.

* Only add to pending if it's not built.

* Add comments.