Skip failing LayoutTest.

Still failing after updating the expectation to Failure Pass Timeout. Skipping the test for now.

See crbug for more details.

BUG=720511
R=thakis@chromium.org

Review-Url: https://codereview.chromium.org/2879693002 .
Cr-Commit-Position: refs/heads/master@{#471110}

third_party/WebKit/LayoutTests/TestExpectations

@@ -3353,11 +3353,11 @@ crbug.com/714862 [ Android ] tables/mozilla/collapsing_borders/bug41262-3.html [
 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 [ Failure Pass Timeout ]
+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 [ 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 ]