[automerger skipped] MultiDexLegacy minsdk bump from 8 to 21 am: d73478c3ea -s ours

am skip reason: Merged-In I3525c27e0f0121e66c4f579aef5cba1999ffdacd with SHA-1 7aad87787d is already in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3148076

Change-Id: Ifd34b42992f25dc1c8cf66dce5fd3105822cd782
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>