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WKWebView and iOS do not permit navigation to arbitrary files on a
device's file system. Attempting to load such inaccessible files in
WKWebView can later trigger broken behavior (see crbug.com/1010526
for more details). To prevent this brokenness, disallow these
navigations right away, rather than waiting for WKWebView to disallow
them.

Bug: 1010526
Change-Id: Ieefb5befad659669a38efad127dfdb6e0179a165
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881667
Commit-Queue: Ali Juma <ajuma@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710125}