This CL enabled display compositor pixel dumps by default, which caused
this group of tests to fail due to either a) minor antialiasing artifacts,
or b) known differences in output due to being captured from the browser
side.

https://chromium-review.googlesource.com/c/chromium/src/+/1213864

These bugs should be resolved with this CL:
 - crbug.com/881040: Media controls now contain an overflow menu.
 - crbug.com/667551: A bunch of tests are listed under this bug, and just
                     require rebaselining to fix non-material single-pixel
                     antialiasing failures.
 - crbug.com/895556: These tests double their background size when the flag
                     is enabled. These were already fixed by another CL,
                     so they are NOT being rebaselined here, just removed
                     from TestExpectations.


Bug: 895912, 881040, 667551, 895556
Change-Id: I14a1065df604151ed06f2a6be4da7eaa53968705
Reviewed-on: https://chromium-review.googlesource.com/c/1303179
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605004}