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Currently, the IFRAME throttle doesn't always work on first-time use,
when the Chrome process is first started. This is because the IFRAME
throttle itself doesn't trigger the plugin list load.

This CL updates the throttle to also trigger the plugin list load
itself (only if it hasn't been loaded already), and should make the
behavior less flaky.

Bug: 924823
Change-Id: If51e85bf2d7005af1a5a825279388dd6d9324409
Reviewed-on: https://chromium-review.googlesource.com/c/1452771
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629878}