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This CL converts FuzzAssociated() of FuzzInterface interface
to new Mojo type

 - Convert InterfaceAssociatedRequest to mojo::PendingAssociatedReceiver
 - Convert AssociatedBindingSet to AssociatedReceiverSet
 - Convert InterfaceAssociatedPtr to mojo::AssociatedRemote

Additionally, this CL adds a copyright to fuzz.mojom.

Bug: 955171
Change-Id: I8942810b085057b8f274bf748c58ecc5cf24c13c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833020Reviewed-by: Oliver Chang <ochang@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#703588}