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Protos that populate the subframe field aren't parsable once serialized
as the is_main_frame field isn't populated. This wasn't caught in any
tests and iframes aren't captured yet. I caught this when working on
some Cluster Telemetry metrics collection.

Bug: 1024640
Change-Id: I4632e07b165da3a47534081e6fa024573c5046ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1914512Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715278}