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Update ExtensionsClient to use that constant.
Also, fix tests using channel overrides to use the more specific
channel: canary instead of trunk. This is done by providing an
override channel class called
ScopedExtensionAPIEnabledInServiceWorkersChannel.

Bug: None
Change-Id: I890a738c66522d4541e24c61761b82aa1bff1ad6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841932Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: David Bertoni <dbertoni@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706142}