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This CL cleans up old Mojo types for mojom::MhtmlFileWriter with
replacing AssociatedBinding and MhtmlFileWriterAssociatedRequest
with AssociatedReceiver and PendingAssociatedReceiver.

Bug: 955171
Change-Id: I55f3209dcddbaa734e029ec34b881015bd5a2d84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880207
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709969}