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This patch modifies the behavior that Back() from assistant_page should
be to the search_result_page.

Bug: 924624
Test: manual
Change-Id: Iba644fee5426ab8b36f47ad4b2e459b1286bd50d
Reviewed-on: https://chromium-review.googlesource.com/c/1455519Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630070}