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This change moves CreateFootnoteView into an anonymous namespace,
and passes in the instance variables it needs. While the
SharingDialogData member is not itself const, none of the members
that CreateFootnoteView depends on change during the lifetime of
SharingDialogView. Unfortunately the member cannot be const since
it contains some callbacks that need to be run, and the members of
SharingDialogData cannot be made const because they are iteratively
filled in by other code before the dialog is created.

Bug: 1011446
Change-Id: I3af6a9a3d3c2e5aa2f1d50dbb560182ccff945c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1901432Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713433}