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The IsIPAddress() was duplicated from GURL::HostIsIPAddress(), but
the internal logic was extracted as url::HostIsIPAddress() in
http://crrev/2562813003, makes IsIPAddress() not necessary anymore. We
could replace IsIPAddress() with url::HostIsIPAddress().

In prepare of a refactor to ProxyBypassRules.

Bug: 1030092
Change-Id: Ie20c17c52803a62782f6773202dc874a5e9aad43
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006191Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Shimi Zhang <ctzsm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733001}