Auto merge of #18207 - bradwerth:reuseImports, r=xidorn

Add a reusable sheets parameter to Servo_StyleSheet_FromUTF8Bytes.

MozReview-Commit-ID: DdMQpUY1WcJ

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https://bugzilla.mozilla.org/show_bug.cgi?id=1387933
https://reviewboard.mozilla.org/r/171308/

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