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The benchmark cannot report metrics correctly for WebView. Also WebView
cares about different startup scenarios and has its own stories for
that.

Bug: 880091
Change-Id: I76bec3c24843a5429bfeec45a53439b19b3d7ef6
Reviewed-on: https://chromium-review.googlesource.com/1217103Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Egor Pasko <pasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590252}