The IOSSystemDataCollector was previously owned by the iOS CrashHandler
and passed in to the iOS InProcessHandler in each method. Move
ownership to iOS InProcessHandler to simplify.
Change-Id: Ifa41304cb1e3e3825a211e6cce5aa730d0edcc95
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3517965
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>