Remove debug flag for ios bots

TBR=borenet
Bug: skia:
Change-Id: I791ad92203ca8cdd6da8abe7c9f45fde528cb7b9
Reviewed-on: https://skia-review.googlesource.com/17409
Reviewed-by: Stephan Altmueller <stephana@google.com>
Commit-Queue: Stephan Altmueller <stephana@google.com>
4 files changed