Add missing import to ServiceWorkerManager
Add missing import to ServiceWorkerManager

Bug: chromium:1011811
Change-Id: I880ec0e66b27d6df8b982f293a3fd5002b802285
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2165798
Commit-Queue: Sigurd Schneider <f04d242e109628a27a0f75fd49a87722bcf291fd@chromium.org>
Commit-Queue: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Auto-Submit: Sigurd Schneider <f04d242e109628a27a0f75fd49a87722bcf291fd@chromium.org>
Reviewed-by: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>

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