Remove unused GroupReference.forGroup(AccountGroup) method

There was only a single usage in a test which could be removed by
rewriting the test slightly.

Change-Id: Ieb062a6f348b0bea2d6d65d93d8f0d2692a9188e
Signed-off-by: Edwin Kempin <ekempin@google.com>
diff --git a/java/com/google/gerrit/common/data/GroupReference.java b/java/com/google/gerrit/common/data/GroupReference.java
index dc22d62..8060659 100644
--- a/java/com/google/gerrit/common/data/GroupReference.java
+++ b/java/com/google/gerrit/common/data/GroupReference.java
@@ -22,11 +22,6 @@
 
   private static final String PREFIX = "group ";
 
-  /** @return a new reference to the given group description. */
-  public static GroupReference forGroup(AccountGroup group) {
-    return new GroupReference(group.getGroupUUID(), group.getName());
-  }
-
   public static GroupReference forGroup(GroupDescription.Basic group) {
     return new GroupReference(group.getGroupUUID(), group.getName());
   }
diff --git a/javatests/com/google/gerrit/server/schema/GroupRebuilderTest.java b/javatests/com/google/gerrit/server/schema/GroupRebuilderTest.java
index a6178ac..ead824f 100644
--- a/javatests/com/google/gerrit/server/schema/GroupRebuilderTest.java
+++ b/javatests/com/google/gerrit/server/schema/GroupRebuilderTest.java
@@ -542,6 +542,8 @@
   public void combineWithBatchGroupNameNotes() throws Exception {
     AccountGroup g1 = newGroup("a");
     AccountGroup g2 = newGroup("b");
+    GroupReference gr1 = new GroupReference(g1.getGroupUUID(), g1.getName());
+    GroupReference gr2 = new GroupReference(g2.getGroupUUID(), g2.getName());
 
     GroupBundle b1 = builder().group(g1).build();
     GroupBundle b2 = builder().group(g2).build();
@@ -551,8 +553,7 @@
     rebuilder.rebuild(repo, b1, bru);
     rebuilder.rebuild(repo, b2, bru);
     try (ObjectInserter inserter = repo.newObjectInserter()) {
-      ImmutableList<GroupReference> refs =
-          ImmutableList.of(GroupReference.forGroup(g1), GroupReference.forGroup(g2));
+      ImmutableList<GroupReference> refs = ImmutableList.of(gr1, gr2);
       GroupNameNotes.updateAllGroups(repo, inserter, bru, refs, newPersonIdent());
       inserter.flush();
     }
@@ -569,9 +570,7 @@
     assertMigratedCleanly(reload(g1), b1);
     assertMigratedCleanly(reload(g2), b2);
 
-    GroupReference group1 = GroupReference.forGroup(g1);
-    GroupReference group2 = GroupReference.forGroup(g2);
-    assertThat(GroupNameNotes.loadAllGroups(repo)).containsExactly(group1, group2);
+    assertThat(GroupNameNotes.loadAllGroups(repo)).containsExactly(gr1, gr2);
   }
 
   @Test