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The serving dir is also included by the pages.

Bug: chromium:883798
Change-Id: Ifb67e19b03303e4929a0e588f5450707adec4835
Reviewed-on: https://chromium-review.googlesource.com/1226484Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Vovo Yang <vovoy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591312}