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CRWWKNavigationHandler.

CRWWebController.didReceiveWebViewNavigationDelegateCallback is called
when it receives any callback from WKWebView. This CL moves it into
CRWWKNavigationHandler and delegates all WKNavigationDelegate callbacks
to CRWWKNavigationHandler. This CL also makes
CRWWebController._isBeingDestroyed visible to CRWWKNavigationHandler
through CRWWKNavigationHandlerDelegate protocol.

Bug: 956511
Change-Id: Iecb377c603eb62e3a7265149b9394c8a2310c3ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1599013
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659422}