[css-contain] Remove tests from TestExpectations that are passing now

r595201 fixed how overflow is clipped in paint containment,
there were two tests failing because of that so we can now unskip them.

TBR=eae@chromium.org,vmpstr@chromium.org

BUG=882322

Change-Id: I029cad3f873f90894bd66a531aee2e2e94b62eb0
Reviewed-on: https://chromium-review.googlesource.com/1256682
Commit-Queue: Manuel Rego <rego@igalia.com>
Reviewed-by: Manuel Rego <rego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#595755}

third_party/WebKit/LayoutTests/TestExpectations

@@ -318,11 +318,9 @@ crbug.com/882385 external/wpt/css/css-contain/quote-scoping-001.html [ Failure ]
 crbug.com/882385 external/wpt/css/css-contain/quote-scoping-002.html [ Failure ]
 crbug.com/882385 external/wpt/css/css-contain/quote-scoping-003.html [ Failure ]
 crbug.com/882385 external/wpt/css/css-contain/quote-scoping-004.html [ Failure ]
-crbug.com/882322 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-paint-clip-002.html [ Failure ]
 crbug.com/881057 [ Mac ] external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-paint-clip-003.html [ Failure ]
 crbug.com/881057 [ Mac ] external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-paint-clip-004.html [ Failure ]
 crbug.com/881057 [ Mac ] external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-paint-clip-005.html [ Failure ]
-crbug.com/882322 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-paint-clip-006.html [ Failure ]
 crbug.com/880802 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-paint-ignored-cases-ruby-stacking-and-clipping-001.html [ Failure ]
 crbug.com/881057 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-paint-stacking-context-001b.html [ Failure ]
 crbug.com/882333 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-size-block-001.html [ Failure ]