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The Abort operation is triggered by the RP, and returns the AbortError.
The current error massage for AbortError is "The user aborted a
request.". The change makes the AbortError massage as
"The Rely Party aborted a request."

Bug: n/a
Change-Id: Iea3991f930ba039d05ec7279aa4b3191303c836f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1642685Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Commit-Queue: Suzy Li <suzyli@google.com>
Cr-Commit-Position: refs/heads/master@{#666096}