Remove superfluous/misleading methods from ChangeEdit

Some of the methods of ChangeEdit were superfluous or misleading.
For this reason, code calling one of those methods is adjusted to work
without them.

Change-Id: I7a2e094bb6eaf5a5ae98e24f03cd615a3c7d0fff

gerrit-server/src/main/java/com/google/gerrit/server/edit/ChangeEdit.java

@@ -18,11 +18,6 @@ import static com.google.common.base.Preconditions.checkNotNull;
 
 import com.google.gerrit.reviewdb.client.Change;
 import com.google.gerrit.reviewdb.client.PatchSet;
-import com.google.gerrit.reviewdb.client.RefNames;
-import com.google.gerrit.reviewdb.client.RevId;
-import com.google.gerrit.server.IdentifiedUser;
-import org.eclipse.jgit.lib.ObjectId;
-import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.revwalk.RevCommit;
 
 /**
@@ -33,44 +28,25 @@ import org.eclipse.jgit.revwalk.RevCommit;
  * change number and P is the patch set number it is based on.
  */
 public class ChangeEdit {
-  private final IdentifiedUser user;
   private final Change change;
-  private final Ref ref;
+  private final String editRefName;
   private final RevCommit editCommit;
   private final PatchSet basePatchSet;
 
   public ChangeEdit(
-      IdentifiedUser user, Change change, Ref ref, RevCommit editCommit, PatchSet basePatchSet) {
-    checkNotNull(user);
-    checkNotNull(change);
-    checkNotNull(ref);
-    checkNotNull(editCommit);
-    checkNotNull(basePatchSet);
-    this.user = user;
-    this.change = change;
-    this.ref = ref;
-    this.editCommit = editCommit;
-    this.basePatchSet = basePatchSet;
+      Change change, String editRefName, RevCommit editCommit, PatchSet basePatchSet) {
+    this.change = checkNotNull(change);
+    this.editRefName = checkNotNull(editRefName);
+    this.editCommit = checkNotNull(editCommit);
+    this.basePatchSet = checkNotNull(basePatchSet);
   }
 
   public Change getChange() {
     return change;
   }
 
-  public IdentifiedUser getUser() {
-    return user;
-  }
-
-  public Ref getRef() {
-    return ref;
-  }
-
-  public RevId getRevision() {
-    return new RevId(ObjectId.toString(ref.getObjectId()));
-  }
-
   public String getRefName() {
-    return RefNames.refsEdit(user.getAccountId(), change.getId(), basePatchSet.getId());
+    return editRefName;
   }
 
   public RevCommit getEditCommit() {