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The Polymer page set is using deprecated feature (/deep/ selector)
and needs to be updated before re-enabling.

BUG=746729,750876

Change-Id: Iac5eb3651d6c22f59e18c8271c9eb5270b44c3d6
Reviewed-on: https://chromium-review.googlesource.com/594908
Commit-Queue: Victor Miura <vmiura@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#491571}