Unskip previously failing tests

third_party/WebKit/LayoutTests/TestExpectations

 # This is the main failure suppression file for Blink LayoutTests.
 # Further documentation:
 # https://chromium.googlesource.com/chromium/src/+/master/docs/testing/layout_test_expectations.md
 
 # Intentional failures to test the layout test system.
 Bug(intentional) harness-tests/crash.html [ Crash ]
 Bug(intentional) harness-tests/timeout.html [ Timeout ]
 
 # TODO(qyearsley): Remove these lines and uncomment other test expectation
 # lines related to CSS tests (crbug.com/706118).
@@ skipping 3151 matching lines @@
 # Sheriff failure 2017-04-26
 crbug.com/713094 [ Win ] fast/css/fontfaceset-check-platform-fonts.html [ Failure Pass ]
 
 # Sheriff failures 2017-04-24
 crbug.com/714862 [ Android ] tables/mozilla/collapsing_borders/bug41262-3.html [ Failure ]
 
 # Sheriff failure 2017-05-05
 crbug.com/703533 [ Mac ] shapedetection/detection-security-test.html  [ Crash Pass Timeout ]
 
 # Sheriff failures 2017-05-11
-crbug.com/720511 [ Linux ] http/tests/misc/non-utf8-header-name.php [ Skip ]
 crbug.com/720511 [ Linux ] http/tests/security/contentSecurityPolicy/directive-parsing-03.html [ Failure Pass Timeout ]
 crbug.com/720511 [ Linux ] http/tests/security/contentSecurityPolicy/source-list-parsing-04.html [ Failure Pass Timeout ]
-crbug.com/720511 [ Linux ] http/tests/security/document-domain-canonicalizes.html [ Failure Pass Timeout ]
-crbug.com/720511 [ Linux ] virtual/mojo-loading/http/tests/misc/non-utf8-header-name.php [ Skip ]
 crbug.com/720511 [ Linux ] virtual/mojo-loading/http/tests/security/contentSecurityPolicy/directive-parsing-03.html [ Failure Pass Timeout ]
 crbug.com/720511 [ Linux ] virtual/mojo-loading/http/tests/security/contentSecurityPolicy/source-list-parsing-04.html [ Failure Pass Timeout ]
-crbug.com/720511 [ Linux ] virtual/mojo-loading/http/tests/security/document-domain-canonicalizes.html [ Failure Pass Timeout ]
-crbug.com/720511 [ Linux ] virtual/off-main-thread-fetch/http/tests/misc/non-utf8-header-name.php [ Skip ]
 
 # Sheriff failures 2017-05-16
 crbug.com/722849 [ Win ] inspector/animation/animation-transition-setTiming-crash.html [ Failure Pass ]
 crbug.com/722212 fast/events/pointerevents/mouse-pointer-event-properties.html [ Failure Timeout Pass ]
 # Crashes on win
 crbug.com/722943 media/audio-repaint.html [ Skip ]
 # Flaky timeout
 crbug.com/723297 virtual/off-main-thread-fetch/http/tests/inspector/service-workers/service-workers-redundant.html [ Timeout ]
 
 # Tests to be run only under virtual/experimental-canvas-features/
@@ skipping 29 matching lines @@
 crbug.com/718155 payments/payment-request-in-iframe-nested-not-allowed.html [ Failure ]
 
 # Layout Tests on Swarming (Windows) - https://crbug.com/717347
 crbug.com/719299 [ Win ] external/wpt/css/css-ui-3/outline-004.html [ Failure Pass Timeout ]
 
 
 # Sheriff failures 2017-05-17
 # Crashes
 crbug.com/723841 http/tests/dom/script-module-load-incomplete-no-crash.html [ Skip ]
 crbug.com/723841 virtual/mojo-loading/http/tests/dom/script-module-load-incomplete-no-crash.html [ Skip ]