Fix an instance of -Wshadow.
Fix an instance of -Wshadow.

Bug: chromium:794619
Change-Id: I4561b1019d9aeee6c25d1d4083b977d0a05abdfc
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3236044
Reviewed-by: Mark Mentovai <f1b5a91d4d6ad523f2610114591c007e75d15084@chromium.org>
Commit-Queue: Peter Kasting <af2833f195af96c34185f741f3f4394197a8590f@chromium.org>

chromium/crashpad,chromium/crashpad,chromium/crashpad