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This fixes renderer kills caused by creating an iframe whose src is
a blob URL created by an opaque origin.

Bug: 1010120
Change-Id: I16b5f148522aa390d2d01c2e08353e834c6a48fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1836533Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Aaron Colwell <acolwell@chromium.org>
Commit-Queue: Aaron Colwell <acolwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702234}