Remove PasswordMetrics#validatePassword() am: 2b32467e37

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2775383

Change-Id: I8190aea5c14fc537e3ec356413c91e1c1b36e57a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>