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If unspecified (in headers or content), resources like HTML in iframes
fall back to the parent's encoding. This should not be the case for
XML/JSON which have well-defined defaults.

Bug: 904017
Change-Id: I42f8950c5c2ef63c98bcec58a1f4b0bd0b190c33
Reviewed-on: https://chromium-review.googlesource.com/c/1331953Reviewed-by: Nate Chapin <japhet@chromium.org>
Reviewed-by: Jinsuk Kim <jinsukkim@chromium.org>
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608483}