Remove old EditCommitMessage RPC

Change-Id: Ic25c5d68f3bb27423b7c6b829169e33c8361eba5
Remove old DeleteDraftChange RPC

Change-Id: I77f1cb57123922aa519eddbeda3b6b9fa44ea559
Remove old publish RPC

Change-Id: I23d2b007ab4f0154d763973f838505f31d071c48
Remove old rebaseChange RPC

Change-Id: Ieb55dd1c01f1161649400a375119bdd89ec50330
Remove old deleteDraftPatchSet RPC

Change-Id: I89f4a6dd5307f40a7b1b58596ce111b5b7c51a0b
Merge changes I89f4a6dd,Ieb55dd1c,I23d2b007,I77f1cb57,Ic25c5d68

* changes:
  Remove old deleteDraftPatchSet RPC
  Remove old rebaseChange RPC
  Remove old publish RPC
  Remove old DeleteDraftChange RPC
  Remove old EditCommitMessage RPC