[automerger skipped] Replace KeyedVector with unordered_map in dispatcher am: bde3d9edd7 am: 75bb743e27 -s ours

am skip reason: Change-Id I969fc03dc38e258e9f3d0f2e60c9534515ce2926 with SHA-1 bde3d9edd7 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/11887942

Change-Id: Ieebd20c0dcc02a27879064c9571ea839f1c2a8fd