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This CL rewrites WebContentsUserData using org.chromium.base.UserData.
There should be no functional change. WebContentsUserData is deleted.

Bug: 877878
Change-Id: Ib8f5b2267bf9d21f84661d2e747d8a6c9c1d9d66
Reviewed-on: https://chromium-review.googlesource.com/1189584
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589456}