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Now that we know this pathway is involved in the incorrect setting of
page scale factors for OOPIFs, convert this CHECK to a DCHECK.

Bug: 859428
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I4d8805056546cc6ada3525e57d307dbcb27e6f55
Reviewed-on: https://chromium-review.googlesource.com/1146329Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577351}