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In the (corner) case that the <iframe> src attribute is relative
to a data URL, the previous behavior was to silently fail. With
this CL, there is now a console message indicating what happened.

Example:
  <iframe id="i"></iframe>
  <script>
    let html = `<iframe src="resource.html"></iframe>`;
    i.src = `data:text/html,${encodeURIComponent(html)}`
  </script>

Bug: 1033313
Change-Id: Ie164edaacd2d92ea2bebc89419782e9204cdf410
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1972493
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726591}