Fixing failing test in Mac by removing expectations

There were some specific web_test expectations that were giving a false
error, while the code was behaving as it should have been behaving in
all the other cases (not mac).

It probably means that at some point a false expectation was uploaded
as rebase, and therefore the rebase was broken, not the actual result.

Bug: 995142
Change-Id: I5bc2cd80a4c75f5daa10e61f55808c5aba1118ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2171596
Commit-Queue: Juanmi Huertas <juanmihd@chromium.org>
Reviewed-by: Yi Xu <yiyix@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771583}

third_party/blink/web_tests/TestExpectations

@@ -5204,9 +5204,6 @@ crbug.com/994008 [ Linux ] http/tests/devtools/elements/styles-3/styles-computed
 crbug.com/994008 [ Win ] http/tests/devtools/elements/styles-3/styles-computed-trace.js [ Pass Failure Timeout ]
 crbug.com/994034 [ Linux ] http/tests/devtools/elements/styles-3/styles-add-new-rule-colon.js [ Pass Failure Timeout ]
 crbug.com/994034 [ Win ] http/tests/devtools/elements/styles-3/styles-add-new-rule-colon.js [ Pass Failure Timeout ]
-crbug.com/995142 crbug.com/900706 [ Mac ] virtual/gpu/fast/canvas/pixelated-canvas.html [ Pass Failure ]
-crbug.com/995142 crbug.com/900706 [ Mac ] virtual/gpu/fast/canvas/pixelated-resize.html [ Pass Failure ]
-crbug.com/995142 crbug.com/900706 [ Mac ] virtual/gpu/fast/canvas/pixelated.html [ Pass Failure ]
 
 crbug.com/995669 [ Win ] http/tests/media/video-throttled-load-metadata.html [ Pass Failure Crash ]