fix(script): Set DedicatedWorkerGlobalScope's origin correctly

<https://html.spec.whatwg.org/multipage/workers.html#worker-processing-model>

> 10.2.4 Processing model
>
> When a user agent is to run a worker for a script with `Worker` or
> `SharedWorker` object `worker`, [...] it must run the following steps.
>
> [...]
>
> 8. Set up a worker environment settings object with `realm execution
>    context` and `outside settings`, and let `inside settings` be the
>    result.

<https://html.spec.whatwg.org/multipage/workers.html#script-settings-for-workers>

> To **set up a worker environment settings object**, given a JavaScript
> execution context `execution context` and environment settings object
> `outside settings`:
>
> 1. Let `inherited origin` be `outside settings`'s origin.
>
> 2. Let `realm` be the value of `execution context`'s Realm component.
>
> 3. Let `worker global scope` be `realm`'s global object.
>
> 4. Let `settings object` be a new environment settings object whose
>    algorithms are defined as follows:
>
>    **The origin** Return a unique opaque origin if `worker global
>    scope`'s url's scheme is "data", and `inherited origin` otherwise.

components/script/dom/dedicatedworkerglobalscope.rs

@@ -53,7 +53,7 @@ use net_traits::IpcSend;
 use parking_lot::Mutex;
 use script_traits::{WorkerGlobalScopeInit, WorkerScriptLoadOrigin};
 use servo_rand::random;
-use servo_url::ServoUrl;
+use servo_url::{ImmutableOrigin, ServoUrl};
 use std::mem::replace;
 use std::sync::atomic::AtomicBool;
 use std::sync::Arc;
@@ -310,7 +310,7 @@ impl DedicatedWorkerGlobalScope {
     #[allow(unsafe_code)]
     // https://html.spec.whatwg.org/multipage/#run-a-worker
     pub fn run_worker_scope(
-        init: WorkerGlobalScopeInit,
+        mut init: WorkerGlobalScopeInit,
         worker_url: ServoUrl,
         from_devtools_receiver: IpcReceiver<DevtoolScriptControlMsg>,
         worker: TrustedWorkerAddress,
@@ -387,6 +387,17 @@ impl DedicatedWorkerGlobalScope {
                     devtools_mpsc_chan,
                 );
 
+                // Step 8 "Set up a worker environment settings object [...]"
+                //
+                // <https://html.spec.whatwg.org/multipage/workers.html#script-settings-for-workers>
+                //
+                // > The origin: Return a unique opaque origin if `worker global
+                // > scope`'s url's scheme is "data", and `inherited origin`
+                // > otherwise.
+                if worker_url.scheme() == "data" {
+                    init.origin = ImmutableOrigin::new_opaque();
+                }
+
                 let global = DedicatedWorkerGlobalScope::new(
                     init,
                     DOMString::from_string(worker_name),

tests/wpt/metadata-layout-2020/workers/dedicated-worker-in-data-url-context.window.js.ini

@@ -1,4 +0,0 @@
-[dedicated-worker-in-data-url-context.window.html]
-  [Create a dedicated worker in a data url dedicated worker]
-    expected: FAIL
-

tests/wpt/metadata/fetch/api/cors/data-url-worker.html.ini

@@ -1,4 +0,0 @@
-[data-url-worker.html]
-  [fetching "top.txt" without ACAO should be rejected.]
-    expected: FAIL
-

tests/wpt/metadata/html/webappapis/the-windoworworkerglobalscope-mixin/Worker_Self_Origin.html.ini

@@ -3,9 +3,6 @@
   [Same Origin SharedWorker]
     expected: FAIL
 
-  [Data Url Worker]
-    expected: FAIL
-
   [Data Url SharedWorker]
     expected: FAIL
 

tests/wpt/metadata/workers/dedicated-worker-in-data-url-context.window.js.ini

@@ -1,4 +0,0 @@
-[dedicated-worker-in-data-url-context.window.html]
-  [Create a dedicated worker in a data url dedicated worker]
-    expected: FAIL
-