[CompositeAfterPaint] Update test expectations

- Remove failure expectation of one passing test
- Rebaseline tests which had subpixel differences along rounded corners,
  etc.

TBR=chrishtr@chromium.org

Bug: 524134
Change-Id: Icdedafa336ee2a7d01101493c674de0d60190b08
Reviewed-on: https://chromium-review.googlesource.com/c/1454806
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629238}
19 files changed