Revert "Throw ClassFormatError for unsupported default methods."

This reverts commit adf0f2e55c285f3fbe0a70c218a8f267029e736c.

Bug: 157170505
Bug: 157575227

Reason for revert: b/157575227

Change-Id: Ibc0aa5505a59deed717555441a9723b5b6561115
7 files changed