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Found while doing an audit of WebContents::GetMainFrame().
web_contents->GetMainFrame()->GetParent() will always return null.

Change-Id: Idc5d2ed719a400a300198b9c36ab4e3307934556
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422440
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809320}