Clean up package structure for Android Passwords settings

Also, remove unnecessary "public" from an interface definition.

This is based on comments in
https://chromium-review.googlesource.com/c/chromium/src/+/809127/3/chrome/android/java/src/org/chromium/chrome/browser/PasswordManagerHandler.java#5

Bug: 788701
Change-Id: Iaf6f06a06fc37663161a610bcb17ffe7f9258119
Reviewed-on: https://chromium-review.googlesource.com/868018
Commit-Queue: Vaclav Brozek <vabr@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530934}
9 files changed