MIMEClassifier::classify always succeeds; fix the type to reflect this.

[eefriedman]

[jdm]

-S-awaiting-review +S-awaiting-answer

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Reviewed 2 of 2 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion, all commit checks successful.

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^{components/net/mime_classifier.rs, line 45 [r1] (raw file):}
Why this change?

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Comments from the review on Reviewable.io

[eefriedman]

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

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^{components/net/mime_classifier.rs, line 45 [r1] (raw file):}
A few lines later, the function calls supplied_type.clone()... that needs to result in (String, String), not Option<(String, String)>.

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Comments from the review on Reviewable.io

[jdm]

@bors-servo: r+
-S-awaiting-answer

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Review status: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from the review on Reviewable.io

[bors-servo]

📌 Commit a4870aa has been approved by jdm

[bors-servo]

⌛ Testing commit a4870aa with merge 4cc42c4...

[bors-servo]

💔 Test failed - linux-dev

[eefriedman]

Fixed unit-test.

[jdm]

@bors-servo: r+

[bors-servo]

📌 Commit 1c49622 has been approved by jdm

[bors-servo]

⌛ Testing commit 1c49622 with merge 7308d0d...

[bors-servo]

💔 Test failed - linux-rel

[jdm]

@bors-servo: retry

• #7787

[bors-servo]

⚡ Previous build results for android, gonk, linux-dev, mac-dev-ref-unit, mac-rel-wpt are reusable. Rebuilding only linux-rel, mac-rel-css...

[bors-servo]

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