Revert "Warn on overriding of hidden methods"

This reverts commit a11ea9ac8a46d2b09f1b568c0e2e849a29dd2046.

Reason for revert: This would just confuse people

Bug: 64382372
Change-Id: I69bdc0fb79831b5ce546205fd40a3300d039de71
5 files changed