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As the comment in login_user_view.h by jdufault@, rename user_menu_ to menu_.

Change-Id: I2658041c0210acc1d41f02790f7d3e7586c58c3a
Reviewed-on: https://chromium-review.googlesource.com/1171976Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Zhuoyu Qian <zhuoyu.qian@samsung.com>
Cr-Commit-Position: refs/heads/master@{#582797}