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This CL sets the CRWWKNavigationHandler as the navigation handler of
WKWebView in CRWWebController. Unused public @property and methods of
CRWWKNavigationHandler are also cleaned up.

Bug: 956511
Change-Id: I1306d080c57872d4d5b293393b31d20f0bc81716
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1634865
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665522}