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Changed Reauth dialog message for Copy password into clipboard feature.
Added new Reauth Purpose reason.

Bug: 917337
Change-Id: If805234969a39a98b24af1816f33c88388a06b87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2061814
Commit-Queue: Viktor Semeniuk <vsemeniuk@google.com>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743012}