We are regularly seeing tests in ContentSuggestionsTestCase failing due to the eg's inability to check the visibility or tap elements on the bottom of the screen.  Investigation shows this seems to be due to the infobar container covering the view (even though the infobar container is empty)

It seems this was introduced, maybe, here: 
https://chromium-review.googlesource.com/c/chromium/src/+/991056/6/ios/chrome/browser/infobars/infobar_container_ios.mm

Potential fix idea:
https://chromium-review.googlesource.com/c/chromium/src/+/1062405