remove windowconfig option (ampproject#4130)

Fixing broken embed-size-* messages. (ampproject#4117)

Fixing broken embed-size-* messages. (ampproject#4117)

add prefetch method (ampproject#4062)

Gracefully handle an error during CID generation. (ampproject#4045)

Ads should work fine, when the CID cannot be provided.

Avoid lazy parsing the function body of AMP extensions. (ampproject#3979

)

Fixes ampproject#3977

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)