Manually rebaseline hidpi tests

The following pixel tests needed rebaselining after switch from quirks
mode to standards mode in r389730:

fast/hidpi/broken-image-icon-hidpi.html
fast/hidpi/image-srcset-invalid-descriptor.html
fast/hidpi/resize-corner-hidpi.html
fast/hidpi/broken-image-with-size-hidpi.html
fast/hidpi/video-controls-in-hidpi.html
fast/hidpi/focus-rings.html
fast/hidpi/clip-text-in-hidpi.html
fast/hidpi/image-set-as-background-with-zoom.html
fast/hidpi/gradient-with-scaled-ancestor.html

TBR=yoav@yoav.ws
BUG=605065

Review URL: https://codereview.chromium.org/1921263002

Cr-Commit-Position: refs/heads/master@{#389758}
35 files changed