Chromium change:

https://chromium.googlesource.com/chromium/src/+/e31e15795d599fd8a53d04ed2bf8832e36fa0ead

commit	e31e15795d599fd8a53d04ed2bf8832e36fa0ead
author	Yue Ru Sun <yrsun@chromium.org>	Fri Jul 19 17:09:57 2019
committer	Commit Bot <commit-bot@chromium.org>	Fri Jul 19 17:09:57 2019
tree	b5d9b74dae9b156ce8c6abb4d635f8d84480ea88
parent	fb39b07fe2369060544e7cadc86f82cba2e43bb8 [diff]
Sync omnibox type proto change

Field name has changed from INVALID to EMPTY in cl/255470920, this patch syncs that change and fix all occurrences.

See https://bugs.chromium.org/p/chromium/issues/detail?id=983220

Bug: 983220