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This fix the linux-chromeos-dbg compile error by export class
PublicAccountWarningDialog.

TBR=xiyuan@chromium.org,msw@chromium.org

Bug: 864549
Change-Id: Ibf7e0b14a17460114563bf40bc562294b86993cb
Reviewed-on: https://chromium-review.googlesource.com/1145864
Commit-Queue: Xiaoyin Hu <xiaoyinh@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#580012}
Reviewed-on: https://chromium-review.googlesource.com/1161082
Cr-Commit-Position: refs/heads/master@{#580307}