Revert "Add submit_action to ChangeInfo"

This reverts commit 0efb17e0532db6bf523def97ec28ba50ae2a728f.
This is already available on a revision as /submit_type.
Clients that need the data should fetch it from there.

Change-Id: Ia6ba213117c4a5c2a09d1129ab741871dfd31a22
3 files changed