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Initially observed in Chrome OS Account Manager's account addition
screen, chrome://chrome-signin does not declare its encoding as UTF-8,
leading to non-ASCII localized text to be displayed incorrectly.

Fix this by declaring the encoding as UTF-8 in the HTML WebUI page.

Bug: 1012269
Change-Id: Idc598157489355f9999e60f0e45f65de07c8f582
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847307Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Kush Sinha <sinhak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703785}