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This CL makes window.open() fail in prerendered pages and return a null
object like other restriction cases (e.g., window.open() in sandboxed
iframes). This doesn't cancel prerendering.

Bug: 1158252
Change-Id: I49fa64c8653fab898076eb91ace3c8386c7cf3f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2589060
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843067}