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This change introduces a CHECK that the ranges passed to
u2f_parsing_utils::Append do not overlap. Calling it with overlapping
ranges results in undefined behavior if a reallocation is necessary
during the Append operation.

Bug: 780078
Change-Id: Ibc83c054bdf8dee81f293c54f980c6735fcc358a
Reviewed-on: https://chromium-review.googlesource.com/999481
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548743}