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Now that widget messages are handled in Blink, there's no need to expose
this method through the public API.

Change-Id: Ica1b737f0095d853fd021b8ce96e694a25772438
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518791Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824021}