Roll src/third_party/breakpad/breakpad/ a61afe7a3..c28363020 (4 commits)

https://chromium.googlesource.com/breakpad/breakpad.git/+log/a61afe7a3e86..c283630201ac

$ git log a61afe7a3..c28363020 --date=short --no-merges --format='%ad %ae %s'
2017-12-15 rsesek Reconcile -[BreakpadController withBreakpadRef:] with its documentation.
2017-12-11 wittman Update binaries with dump_syms changes to write new field
2017-12-11 wittman Write field indicating multiple symbols at an address in dump_syms
2017-12-05 adamharrison Remove duplicate import.

Created with:
  roll-dep src/third_party/breakpad/breakpad

Change-Id: I75b9d3a240b9818e2f527a591c6be2a61974088c
Reviewed-on: https://chromium-review.googlesource.com/829674


Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524410}