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This CL updates the pageset for leak detection benchmark and update the wpr as well.

Bug: 763280
Change-Id: Ic8d873ecb94c060c10589aa5ce535808e90620ea
Reviewed-on: https://chromium-review.googlesource.com/828422Reviewed-by: Keishi Hattori <keishi@chromium.org>
Commit-Queue: Yuzu Saijo <yuzus@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524715}