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Date-related wtf functions are for JavaScriptCore in WebKit. For
the obvious reason, Blink does not need them except for parsing
Date in HTTP header (last modified). For that, switch to ICU
and use the same algorithm as specified in the latest Ecma 262 spec.

The need for this CL was identified while working on
https://chromium-review.googlesource.com/1111818 , but it hasn't
been made a CL until now.

Bug: None
Change-Id: I69f04e13744fdc914f58fca6d0a88993173a58e4
Reviewed-on: https://chromium-review.googlesource.com/c/1103675Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Jungshik Shin <jshin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610437}