[css-contain] Unskip tests that are actually passing

There were a few tests related to size containment and select elements
marked as failure in TestExpectations, but they're actually passing.

Change-Id: I562b63be72ddf192ed78b3995033c8d35ab345fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1695546Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676085}

third_party/blink/web_tests/TestExpectations

@@ -3391,10 +3391,6 @@ crbug.com/626703 [ Retina ] virtual/blink-cors/external/wpt/referrer-policy/no-r
 crbug.com/626703 [ Retina ] virtual/blink-cors/external/wpt/fetch/api/request/request-headers.html [ Timeout ]
 crbug.com/626703 [ Retina ] virtual/blink-cors/external/wpt/referrer-policy/no-referrer/meta-referrer/cross-origin/http-https/iframe-tag/no-redirect/generic.http.html [ Timeout ]
 crbug.com/626703 [ Retina ] virtual/blink-cors/external/wpt/fetch/api/request/request-bad-port.html [ Timeout ]
-crbug.com/626703 [ Mac ] virtual/layout_ng_experimental/external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-size-select-elem-001.html [ Failure ]
-crbug.com/626703 [ Mac ] external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-size-select-elem-002.html [ Failure ]
-crbug.com/626703 [ Mac ] virtual/layout_ng_experimental/external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-size-select-elem-002.html [ Failure ]
-crbug.com/626703 [ Mac ] external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-size-select-elem-001.html [ Failure ]
 crbug.com/626703 [ Mac ] external/wpt/css/css-fonts/font-family-name-025.html [ Failure ]
 crbug.com/626703 [ Retina ] virtual/blink-cors/external/wpt/referrer-policy/no-referrer/http-rp/same-origin/http-http/script-tag/keep-origin-redirect/generic.http.html [ Timeout ]
 crbug.com/626703 [ Retina ] virtual/blink-cors/external/wpt/referrer-policy/no-referrer-when-downgrade/http-rp/same-origin/http-http/script-tag/swap-origin-redirect/insecure-protocol.http.html [ Timeout ]