I can't reproduce this on Linux with ToT (note you need to set for a color printer and turn on background graphics printing).

On Windows I can reproduce it, although it printed fine in B&W.

The apparently blue background behind the header is in fact a blue background with a blue image over the top half of it. The line appears at the bottom of the image, despite the fact that the blue background should go all the way under the image. When we paint this in Blink we paint the background color and the image without any clipping, so my guess is that the artifact is due to scaling the image and getting some white pixels in the scaled version.

Personally I think this is a very low priority, so I'm marking it as such.

Also, regressions from more than 3 versions back are not regressions for the purposes of bug tracking.

This issue has been available for more than 365 days, and should be re-evaluated. Please re-triage this issue.
The Hotlist-Recharge-Cold label is applied for tracking purposes, and should not be removed after re-triaging the issue.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot