Remove dead method to build

Change-Id: I011ece9ea806a4e25e2e05ff021788a939133d5a
diff --git a/src/main/java/com/android/tools/r8/ir/optimize/enums/EnumUnboxingCandidateInfoCollection.java b/src/main/java/com/android/tools/r8/ir/optimize/enums/EnumUnboxingCandidateInfoCollection.java
index 3f90171..9feeed2 100644
--- a/src/main/java/com/android/tools/r8/ir/optimize/enums/EnumUnboxingCandidateInfoCollection.java
+++ b/src/main/java/com/android/tools/r8/ir/optimize/enums/EnumUnboxingCandidateInfoCollection.java
@@ -159,10 +159,6 @@
               graphLensForPrimaryOptimizationPass);
     }
 
-    public Set<DexProgramClass> getSubclasses() {
-      return subclasses;
-    }
-
     public void setSubclasses(Set<DexProgramClass> subclasses) {
       this.subclasses = subclasses;
     }