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Fixes a couple of instances where portals could get page focus:

1) Committing a pending navigation in an iframe inside a portal could
   cause the portal's frame tree to receive page focus
2) A predecessor page after activation would still have page focus when
   orphaned (not inserted into DOM)

Bug: 1030838
Change-Id: I671d35fbb9b0041adb2d91082e1e6b1ac7a47a0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2563870Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846114}