Revert "Undo generated checkin."

This reverts commit b7a3f0c93935b5c81a142cb186e58f3c7b861893.
Revert "Merge branch 'master' of https://github.com/fugalh/blockly into fugalh-master"

This reverts commit a71d5fd589c88d33c557b8baa1a5520fa025c422, reversing
changes made to d55e2cd72d160e6a7660f3c62a42d5078b7111e6.