In a later CL, in some cases these structs were not zero-initialized
which caused some iOS tests to fail.
We now zero-initialize these structs which should be harmless now,
and useful later.
Bug: 1250098
Change-Id: I933e80e56714a1d8988deae3aa56ec36ed98ef03
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3538665
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>