Have sendBeacon throw for Blobs with a type that is not CORS-safelisted.

third_party/WebKit/LayoutTests/TestExpectations

 # 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).
 crbug.com/706118 external/wpt/css/css-flexbox-1 [ Skip ]
 crbug.com/706118 external/wpt/css/css-scoping-1 [ Skip ]
 crbug.com/706118 external/wpt/css/css-shapes-1 [ Skip ]
 crbug.com/706118 external/wpt/css/css-text-3 [ Skip ]
@@ skipping 1646 matching lines @@
 # These tests have test harness errors and PASS lines that have a
 # non-deterministic order.
 crbug.com/705125 fast/mediacapturefromelement/CanvasCaptureMediaStream-capture-out-of-DOM-element.html [ Failure ]
 crbug.com/705125 http/tests/security/cors-rfc1918/addressspace-document-appcache.html [ Failure ]
 crbug.com/705125 http/tests/security/cors-rfc1918/addressspace-document-csp-appcache.html [ Failure ]
 crbug.com/705125 http/tests/w3c/webperf/submission/Intel/user-timing/test_user_timing_clearMarks.html [ Failure ]
 crbug.com/705125 virtual/mojo-loading/http/tests/w3c/webperf/submission/Intel/user-timing/test_user_timing_clearMarks.html [ Failure ]
 crbug.com/705125 virtual/mojo-loading/http/tests/security/cors-rfc1918/addressspace-document-appcache.html [ Failure ]
 crbug.com/705125 virtual/mojo-loading/http/tests/security/cors-rfc1918/addressspace-document-csp-appcache.html [ Failure ]
 
-# This test breaks when the feature introduced in the bug is enabled. We keep
-# this tested without the feature by using the virtual test. See
-# virtual/stable/http/tests/sendbeacon/beacon-cross-origin-redirect-blob-expected.txt
-crbug.com/490015 http/tests/sendbeacon/beacon-cross-origin-redirect-blob.html [ Skip ]
-crbug.com/490015 virtual/mojo-loading/http/tests/sendbeacon/beacon-cross-origin-redirect-blob.html [ Skip ]
-# This test doesn't need to be run with the stable release mode.
-crbug.com/490015 virtual/stable/http/tests/sendbeacon/beacon-blob-with-non-simple-type.html [ Skip ]
 # This test fails with the stable release mode.
 crbug.com/694958 virtual/stable/http/tests/navigation/same-and-different-back.html [ Skip ]
 
 # These tests have console error messages whose order is not deterministic.
 crbug.com/679742 external/wpt/html/semantics/scripting-1/the-script-element/module/crossorigin.html [ Pass Failure ]
 crbug.com/679742 external/wpt/html/semantics/scripting-1/the-script-element/module/errorhandling.html [ Pass Failure ]
 
 # This test has a failure console message with specific performance
 # numbers so a consistent baseline cannot be added. This test could be
 # imported if the test passed or if the results for testharness tests
@@ skipping 936 matching lines @@
 
 # WritableStream test timeouts due to out-of-date tests. Only applies to the M-59 branch.
 crbug.com/713664 external/wpt/streams/writable-streams/aborting.dedicatedworker.html [ Timeout ]
 crbug.com/713664 external/wpt/streams/writable-streams/aborting.html [ Timeout ]
 crbug.com/713664 external/wpt/streams/writable-streams/aborting.serviceworker.https.html [ Timeout ]
 crbug.com/713664 external/wpt/streams/writable-streams/aborting.sharedworker.html [ Timeout ]
 crbug.com/713664 external/wpt/streams/writable-streams/start.dedicatedworker.html [ Timeout ]
 crbug.com/713664 external/wpt/streams/writable-streams/start.html [ Timeout ]
 crbug.com/713664 external/wpt/streams/writable-streams/start.serviceworker.https.html [ Timeout ]
 crbug.com/713664 external/wpt/streams/writable-streams/start.sharedworker.html [ Timeout ]