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This CL modifies the frame-tree/session-history walk mechanism to only
consider WebContents in the same BrowsingContext as the WebContents
that is currently navigating and making the OIOI decision. This is to
prevent OIOI state from leaking between BrowsingContexts.

Bug: 1148379
Change-Id: I72bb4c0e3e6ffabbc8828eb2d59cae9e48b59b28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2534260
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826965}