ChangeData: Remove unused setRefStates method

I removed the last caller inside Google. The method
is superseded by a strongly typed equivalent.

Change-Id: I2982c7db89138893a655baa7a2f34f1626cb057a
diff --git a/java/com/google/gerrit/server/query/change/ChangeData.java b/java/com/google/gerrit/server/query/change/ChangeData.java
index 852387f..8b4e4c7 100644
--- a/java/com/google/gerrit/server/query/change/ChangeData.java
+++ b/java/com/google/gerrit/server/query/change/ChangeData.java
@@ -38,7 +38,6 @@
 import com.google.common.flogger.FluentLogger;
 import com.google.common.primitives.Ints;
 import com.google.gerrit.common.Nullable;
-import com.google.gerrit.common.UsedAt;
 import com.google.gerrit.entities.Account;
 import com.google.gerrit.entities.AttentionSetUpdate;
 import com.google.gerrit.entities.Change;
@@ -1287,12 +1286,6 @@
     return refStates;
   }
 
-  @UsedAt(UsedAt.Project.GOOGLE)
-  public void setRefStates(Iterable<byte[]> refStates) {
-    // TODO(hanwen): remove Google use, and drop this method.
-    setRefStates(RefState.parseStates(refStates));
-  }
-
   public void setRefStates(ImmutableSetMultimap<Project.NameKey, RefState> refStates) {
     this.refStates = refStates;
     if (draftsByUser == null) {