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The thread ServiceWorkerContextCore lives on (the "core thread")
will move from the IO thread to the UI thread. This CL makes the
check for extensions work when the feature is enabled.

Bug: 824858
Change-Id: I6f9054bc3d77b8261b7e832e97f6cc71e2b3013d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1763651Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689724}