Cleanup some unneeded let bindings

[dzbarsky]

[Ms2ger]

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

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Reviewed 5 of 5 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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^{ports/cef/window.rs, line 472 [r1] (raw file):}
This does not look correct.

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Comments from the review on Reviewable.io

[dzbarsky]

Review status: all files reviewed at latest revision, 1 unresolved discussion.

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^{ports/cef/window.rs, line 472 [r1] (raw file):}
I was guessing here, what's the problem? (Is there a way to compile the CEF port on OSX?)

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Comments from the review on Reviewable.io

[eefriedman]

Review status: all files reviewed at latest revision, 1 unresolved discussion.

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^{ports/cef/window.rs, line 472 [r1] (raw file):}
Among other things, the variable frame_url isn't defined anywhere.

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Comments from the review on Reviewable.io

[jdm]

./mach build-cef

[dzbarsky]

OK it actually builds now

[bors-servo]

☔ The latest upstream changes (presumably #8305) made this pull request unmergeable. Please resolve the merge conflicts.

[Ms2ger]

Reviewed 5 of 5 files at r2.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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^{ports/cef/window.rs, line 472 [r1] (raw file):}
You no longer update servoframe.url. Just revert these changes, please.

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Comments from the review on Reviewable.io

[bors-servo]

☔ The latest upstream changes (presumably #8312) made this pull request unmergeable. Please resolve the merge conflicts.

[dzbarsky]

Ok done

[Ms2ger]

Needs a rebase now.

[dzbarsky]

Rebased.

[Ms2ger]

@bors-servo r+

[bors-servo]

📌 Commit dfc90db has been approved by Ms2ger

[bors-servo]

⌛ Testing commit dfc90db with merge 69e6eb4...

[bors-servo]

☀️ Test successful - android, gonk, linux-dev, linux-rel, mac-dev-ref-unit, mac-rel-css, mac-rel-wpt