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Looking at the callsites of SetPageFocus, we only set is_focused for
main frame RWHs.

Change-Id: Ib28e28ea83d4815469484c509921dcde4143135c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611945Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842062}