Disable cross origin check for mozbrowser-enabled top level pipelines

[paulrouget]

Closes #9582

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This change is

[Ms2ger]

Remove components/script/parser.out.

[paulrouget]

Remove components/script/parser.out.

Done.

[paulrouget]

Anything in particular that might prevent this to land?

[jdm]

-S-awaiting-review +S-needs-code-changes

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Reviewed 3 of 4 files at r1.
Review status: all files reviewed at latest revision, 3 unresolved discussions.

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components/script/dom/xmlhttprequest.rs, line 878 [r2] (raw file):
This breaks XHR in workers, since this method panics for non-windows.

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tests/wpt/mozilla/tests/mozilla/mozbrowser/crossorigin_xhr.html, line 14 [r2] (raw file):
this.unreached_func("Cross origin xhr() should not have failed");

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tests/wpt/mozilla/tests/mozilla/mozbrowser/crossorigin_xhr.html, line 19 [r2] (raw file):
this.step_func_done and remove the t.done().

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Comments from the review on Reviewable.io

[paulrouget]

Addressed comments. For workers, I don't think there's an easy way to know if it's part of the top level window. We don't need it now though.

[jdm]

-S-awaiting-review +S-needs-code-changes

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Reviewed 3 of 3 files at r3.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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components/script/dom/xmlhttprequest.rs, line 878 [r1] (raw file):

if let GlobalRoot::Window(win) = self.global() {
    let is_root_pipeline = win.parent_info.is_none();
    ...
}

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Comments from the review on Reviewable.io

[jdm]

@bors-servo: r+

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Reviewed 2 of 2 files at r4.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from the review on Reviewable.io

[bors-servo]

📌 Commit dd08e90 has been approved by jdm

[bors-servo]

⌛ Testing commit dd08e90 with merge 37799a4...

[bors-servo]

☀️ Test successful - android, arm32, gonk, linux-dev, linux-rel, mac-dev-unit, mac-rel-css, mac-rel-wpt, status-appveyor