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The method has been introduced for ServiceWorkerOnUI.
The feature has already fully launched, so let's remove it.

Unfortunately, I found a few methods still need to be called from the IO
thread. Instead of changing the callsites, this CL simply keeps those
methods callbable from any threads. Updated the comment along with that.

Bug: 1138155
Change-Id: If919c1f87fc2d6d5ce5e74f1254eb0f41676acc0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2599573
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842478}