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Write a test of mouse_lock_widget_ cleanup. Fix WebContentsImpl so that it passes.

Bug: 820593, 821187

Change-Id: I99cd6b8c728f7e4501205574db8d17b206f2856e
Reviewed-on: https://chromium-review.googlesource.com/957479
Commit-Queue: Nick Carter <nick@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Lucas Gadani <lfg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542865}