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Popup metadata is now attached directly to WebContents instances and
is no longer stored as FrameImpl fields.

Bug: 888131
Testing: all existing browser tests pass
Change-Id: Id8d2e3d94a350302689dc3c61b987192b5115db8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1766352
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689718}