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WebContentsObserver.NavigationEntryChanged is required for Tab.
The plumbing was done not through WebContentsObserver->Proxy but
from Tab native to Java directly via native WCO. This CL does it
properly.

Bug: 925242
Change-Id: I59989f3257f9249a6a07fe57ee7b6a5a07fc920e
Reviewed-on: https://chromium-review.googlesource.com/c/1481177Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636211}