Delete Sky tests that we're not going to run with Dart

sky/tests/TestExpectations

 
-# These tests require gc() to be exposed.
-crbug.com/1 mutation-observer/observer-wrapper-dropoff-transient.sky [ Skip ]
-crbug.com/1 mutation-observer/observer-wrapper-dropoff.sky [ Skip ]
-crbug.com/1 mutation-observer/transient-gc-crash.sky [ Skip ]
-crbug.com/1 mutation-observer/weak-callback-gc-crash.sky [ Skip ]
-
 # These tests need more basic testing support plumbed right into the
 # platform, which we don't currently have:
 https://github.com/domokit/mojo/issues/15 parser/cr.sky [ Skip ]
 https://github.com/domokit/mojo/issues/15 parser/empty.sky [ Skip ]
 #https://github.com/domokit/mojo/issues/15 parser/utf16.sky [ Skip ]
 
 # These tests fail
 https://github.com/domokit/mojo/issues/14 parser/normaliser-null.sky [ Skip ]
 https://github.com/domokit/mojo/issues/14 parser/utf16.sky [ Skip ]
 https://github.com/domokit/mojo/issues/16 parser/normaliser-crlf.sky [ Skip ]
 
-# These tests are flaky on the bots
-https://github.com/domokit/mojo/issues/24 custom-elements/constructor-calls-created-synchronously.sky [ Skip ]
-https://github.com/domokit/mojo/issues/24 mutation-observer/observe-attributes.sky [ Skip ]
-
+# We don't implement embed ViewManagerClient yet.
 crbug.com/2 services/iframe-embed-vmc.sky [ Skip ]
 
-# This test only fails on the bots:
-#crbug.com/434822 inspector/page-agent-get-resource-tree.sky [ Pass Failure ]
-
 # These tests broke during the Dart migration
 crbug.com/2 animation/basic-imperative.sky [ Skip ]
 crbug.com/2 animation/basic-transition.sky [ Skip ]
-crbug.com/2 custom-elements/document-register-basic.sky [ Skip ]
-crbug.com/2 custom-elements/document-register-reentrant-null-constructor.sky [ Skip ]
-crbug.com/2 custom-elements/document-register-reentrant-returning-fake.sky [ Skip ]
-crbug.com/2 custom-elements/document-register-reentrant-throwing-constructor.sky [ Skip ]
-crbug.com/2 custom-elements/element-upgrade-no-register-and-leak.sky [ Skip ]
-crbug.com/2 custom-elements/generated-constructor.sky [ Skip ]
-crbug.com/2 custom-elements/html-element-type-extension-assert.sky [ Skip ]
-crbug.com/2 custom-elements/lifecycle-created-createElement-recursion.sky [ Skip ]
-crbug.com/2 custom-elements/lifecycle-created-createElement-reentrancy.sky [ Skip ]
-crbug.com/2 custom-elements/lifecycle-created-parser-script.sky [ Skip ]
-crbug.com/2 custom-elements/resources/document-register-fuzz.sky [ Skip ]
 crbug.com/2 editing/backspace.sky [ Skip ]
 crbug.com/2 editing/delete_block_contents.sky [ Skip ]
 crbug.com/2 editing/replace.sky [ Skip ]
 crbug.com/2 editing/selection.sky [ Skip ]
 crbug.com/2 editing/typing.sky [ Skip ]
 crbug.com/2 events/gesture-events.sky [ Skip ]
 crbug.com/2 events/pointer-events.sky [ Skip ]
 crbug.com/2 framework/binding.sky [ Skip ]
 crbug.com/2 framework/citylist-scrolled.sky [ Skip ]
 crbug.com/2 framework/citylist.sky [ Skip ]
 crbug.com/2 framework/flights-app.sky [ Skip ]
 crbug.com/2 framework/observe.sky [ Skip ]
 crbug.com/2 framework/templates.sky [ Skip ]
 crbug.com/2 framework/xmlhttprequest/empty-responseType.sky [ Skip ]
 crbug.com/2 framework/xmlhttprequest/responseType.sky [ Skip ]
 crbug.com/2 framework/xmlhttprequest/unicode-post.sky [ Skip ]
 crbug.com/2 framework/xmlhttprequest/xhr-does-not-exist.sky [ Skip ]
 crbug.com/2 framework/xmlhttprequest/xhr-relative.sky [ Skip ]
 crbug.com/2 framework/xmlhttprequest/xhr.sky [ Skip ]
-crbug.com/2 inspector/css-computed-style.sky [ Skip ]
-crbug.com/2 inspector/dom-mutation-modify-text-node-and-append.sky [ Skip ]
-crbug.com/2 inspector/dom-mutation.sky [ Skip ]
-crbug.com/2 inspector/page-agent-get-resource-tree.sky [ Skip ]
-crbug.com/2 js/classes.sky [ Skip ]
 crbug.com/2 layout/margins-absolute.sky [ Skip ]
 crbug.com/2 layout/margins.sky [ Skip ]
 crbug.com/2 lowlevel/createElement.sky [ Skip ]
-crbug.com/2 mocha/describe-only.sky [ Skip ]
-crbug.com/2 mocha/it-only.sky [ Skip ]
 crbug.com/2 modules/application.sky [ Skip ]
 crbug.com/2 modules/instance-of-application.sky [ Skip ]
 crbug.com/2 modules/instance-of-module.sky [ Skip ]
 crbug.com/2 modules/load-event.sky [ Skip ]
 crbug.com/2 modules/modules.sky [ Skip ]
-crbug.com/2 modules/resources/does-not-export.sky [ Skip ]
-crbug.com/2 modules/resources/instance-of-module-module.sky [ Skip ]
-crbug.com/2 modules/resources/intermediate.sky [ Skip ]
-crbug.com/2 modules/resources/pass.sky [ Skip ]
 crbug.com/2 modules/script-import.sky [ Skip ]
-crbug.com/2 mutation-observer/callback-arguments.sky [ Skip ]
-crbug.com/2 mutation-observer/clear-transient-without-delivery.sky [ Skip ]
-crbug.com/2 mutation-observer/create-during-delivery.sky [ Skip ]
-crbug.com/2 mutation-observer/cross-document.sky [ Skip ]
-crbug.com/2 mutation-observer/delivery-order.sky [ Skip ]
-crbug.com/2 mutation-observer/disconnect-cancel-pending.sky [ Skip ]
-crbug.com/2 mutation-observer/document-fragment-insertion.sky [ Skip ]
-crbug.com/2 mutation-observer/mutate-during-delivery.sky [ Skip ]
-crbug.com/2 mutation-observer/mutation-callback-non-element-crash.sky [ Skip ]
-crbug.com/2 mutation-observer/mutation-observer-constructor.sky [ Skip ]
-crbug.com/2 mutation-observer/mutation-record-constructor.sky [ Skip ]
-crbug.com/2 mutation-observer/mutation-record-nullity.sky [ Skip ]
-crbug.com/2 mutation-observer/observe-characterdata.sky [ Skip ]
-crbug.com/2 mutation-observer/observe-childList.sky [ Skip ]
-crbug.com/2 mutation-observer/observe-exceptions.sky [ Skip ]
-crbug.com/2 mutation-observer/observe-options-attributes.sky [ Skip ]
-crbug.com/2 mutation-observer/observe-options-character-data.sky [ Skip ]
-crbug.com/2 mutation-observer/observe-subtree.sky [ Skip ]
-crbug.com/2 mutation-observer/script-append.sky [ Skip ]
-crbug.com/2 mutation-observer/shadow-dom.sky [ Skip ]
-crbug.com/2 mutation-observer/takeRecords.sky [ Skip ]
 crbug.com/2 parser/script.sky [ Skip ]
 crbug.com/2 services/buffer.sky [ Skip ]
 crbug.com/2 services/codec.sky [ Skip ]
 crbug.com/2 services/core.sky [ Skip ]
 crbug.com/2 services/event-sender.sky [ Skip ]
 crbug.com/2 services/iframe-service-provider.sky [ Skip ]
 crbug.com/2 services/network.sky [ Skip ]