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Previously the media app was unable to perform a save as operation on a
file obtained from a drag and drop or from a paste event. This was
because the logic surrounding the operation was encapsulated in
ReceivedFile which is a class the media app does not have access to.
This cl updates the requestSaveFile IPC to return a ReceivedFile
instead of returning a file token, allowing the media app to obtain a
native file, overwrite it and copy over it's functions so future saves
can happen in place.

The google3 side of this change is @ cl/334717684.

Bug: b/165769056, b/169630668
Change-Id: Ied8dd540f9f319b18b427e6566851bc628ed3204
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439969Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: dstockwell <dstockwell@google.com>
Commit-Queue: Zain Afzal <zafzal@google.com>
Cr-Commit-Position: refs/heads/master@{#812607}