Fix iOS implementation of |GetCurrentMonotonicMicros|. Fixes regression introduced in dd4ef2909893c055f584e1e8aeecd4c093b077e2
Fix iOS implementation of |GetCurrentMonotonicMicros|.
Fixes regression introduced in dd4ef2909893c055f584e1e8aeecd4c093b077e2

R=rmacnak@google.com

Review URL: https://codereview.chromium.org/1571343003 .

dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk