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The thread ServiceWorkerContextCore lives on (the "core thread") will
move from the IO thread to the UI thread when the ServiceWorkerOnUI
feature is enabled.

This CL makes code in content/browser/notifications aware of the core
thread instead of assuming the IO thread. This makes the remaining
"Push*" browser_tests pass when the feature is enabled.

Bug: 824858
Change-Id: Ice834d2d4a69505b977cb469b516e0705c36202c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1768602Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690276}