This CL make the iterators implemented by AnnotationList compliant to
the requirements imposed by the C++ standard on input iterators.
Change-Id: I263c94a97f5bcd7edd5ef4d8b65fa28b11876974
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/5093147
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>