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The only usage of this API is for the RenderViewImpl notifying observers
that a commit has happened. This callback can simply occur on the
WebViewClient API.

BUG=1097816

Change-Id: Ic9f5fd946c18498ee87d6a3d5f58b04729b5081b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2492887Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820348}