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This cl reorders the functions in search_box_view to make the
readability better.

Bug: 828603
Test: manual.
Change-Id: Ic2fa5c7bb0852504a4b1056d66f60ed7800c9c66
Reviewed-on: https://chromium-review.googlesource.com/994134Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547964}