diff --git a/src/tools/xcode-common/java/com/google/devtools/build/xcode/util/Difference.java b/src/tools/xcode-common/java/com/google/devtools/build/xcode/util/Difference.java
deleted file mode 100644
index 54bd567f28ca96..00000000000000
--- a/src/tools/xcode-common/java/com/google/devtools/build/xcode/util/Difference.java
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright 2014 Google Inc. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//    http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.devtools.build.xcode.util;
-
-import com.google.common.collect.Sets;
-
-import java.util.Set;
-
-/**
- * Provides utility methods that make difference operations type safe.
- *
- * {@link Sets#difference(Set, Set)} requires no type bound on the second set, which has led to
- * calls which can never subtract any elements because the set being subtracted cannot contain any
- * elements which may exist in the first set.
- */
-public class Difference {
-  private Difference() {
-    throw new UnsupportedOperationException("static-only");
-  }
-
-  /**
-   * Returns the elements in set1 which are not in set2. set2 may contain extra elements which will
-   * be ignored.
-   *
-   * @param set1 Set whose elements to return
-   * @param set2 Set whose elements are to be subtracted
-   */
-  public static <T> Set<T> of(Set<T> set1, Set<T> set2) {
-    return Sets.difference(set1, set2);
-  }
-}