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This change ensures that the pending container policy is used (along with the
pending sandbox flags) when constructing a new renderframe to support a cross-
origin navigation.

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Bug: 716478
Change-Id: Ib6b46ea639e660527e4e144845dcaea4b8e2695f
Reviewed-on: https://chromium-review.googlesource.com/490466Reviewed-by: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#468369}