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The helper is no longer used. Mocking chrome.send() calls is happening
via the use of browser proxies in all newer WebUIs.

Fixed: 1148403
Change-Id: I543ad1d36a0a92110182b4998380b3061c478f78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537770
Auto-Submit: dpapad <dpapad@chromium.org>
Commit-Queue: Esmael Elmoslimany <aee@chromium.org>
Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827997}