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This CL creates CRWJSNavigationHandler, and moves "window.hashchange"
handling from CRWWebController into this new class.

Bug: 956511
Change-Id: I84d756a80b3b34773fcd4bc02c9ba3da6d1398db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1649683
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#669157}