This reverts commit 7dd52e61e0.
Users are confused by calling the button Merge Change.
Some projects use submit type fast-forward only, which never creates
a merge. Some are cherry pick, which is confusing to have a button
called "Cherry Pick" next to another called "Merge Change".
Change-Id: I5d7e1d21a1157d1df8f808cda2ff967a65645979
cf52d85d45