Revert of [worklets] Introduce ThreadedWorkletMessagingProxy and AnimationWorkletMessagaingProxy.

third_party/WebKit/LayoutTests/http/tests/worklet/resources/import-tests.js

-// Runs a series of tests related to importing scripts on a worklet.
-//
-// Usage:
-// runImportTests(workletType);
-function runImportTests(worklet) {
-    promise_test(function() {
-
-        return worklet.import('resources/empty-worklet-script.js').then(function(undefined_arg) {
-            assert_equals(undefined_arg, undefined, 'Promise should resolve with no arguments.');
-        }).catch(function(error) {
-            assert_unreached('unexpected rejection: ' + error);
-        });
-
-    }, 'Importing a script resolves the given promise.');
-
-    promise_test(function() {
-
-        return worklet.import('resources/throwing-worklet-script.js').then(function(undefined_arg) {
-            assert_equals(undefined_arg, undefined, 'Promise should resolve with no arguments.');
-        }).catch(function(error) {
-            assert_unreached('unexpected rejection: ' + error);
-        });
-
-    }, 'Importing a script which throws should still resolve the given promise.');
-
-    promise_test(function() {
-
-        return worklet.import('non-existant-worklet-script.js').then(function() {
-            assert_unreached('import should fail.');
-        }).catch(function(error) {
-            assert_equals(error.name, 'NetworkError', 'error should be a NetworkError.');
-        });
-
-    }, 'Importing a non-existant script rejects the given promise with a NetworkError.');
-
-    promise_test(function() {
-
-        return worklet.import('http://invalid:123$').then(function() {
-            assert_unreached('import should fail.');
-        }).catch(function(error) {
-            assert_equals(error.name, 'SyntaxError', 'error should be a SyntaxError.');
-        });
-
-    }, 'Attempting to resolve an invalid URL should reject the given promise with a SyntaxError.');
-}