Supress some ErrorProne warnings

Change-Id: Iaa2651d999f1b2ba833030209daa8619932c838d
diff --git a/user/test/com/google/gwt/emultest/java/util/PriorityQueueTest.java b/user/test/com/google/gwt/emultest/java/util/PriorityQueueTest.java
index 9342911..6b07adf 100644
--- a/user/test/com/google/gwt/emultest/java/util/PriorityQueueTest.java
+++ b/user/test/com/google/gwt/emultest/java/util/PriorityQueueTest.java
@@ -49,6 +49,7 @@
     assertTrue(Arrays.asList(1, 2).containsAll(queue));
   }
 
+  @SuppressWarnings("ModifyingCollectionWithItself")
   public void testAddAll() {
     PriorityQueue<Integer> queue = new PriorityQueue<>();
     try {
diff --git a/user/test/com/google/gwt/emultest/java/util/TreeMapTest.java b/user/test/com/google/gwt/emultest/java/util/TreeMapTest.java
index e614fd1..783ff66 100644
--- a/user/test/com/google/gwt/emultest/java/util/TreeMapTest.java
+++ b/user/test/com/google/gwt/emultest/java/util/TreeMapTest.java
@@ -612,6 +612,7 @@
     _assertEquals(map.keySet(), keySet.descendingSet());
   }
 
+  @SuppressWarnings("ModifyingCollectionWithItself")
   public void testDescendingKeySet_viewPut() {
     K[] keys = getSortedKeys();
     V[] values = getSortedValues();
@@ -1974,6 +1975,7 @@
     _assertEmpty(map);
   }
 
+  @SuppressWarnings("ModifyingCollectionWithItself")
   public void testNavigableKeySet_viewPut() {
     K[] keys = getSortedKeys();
     V[] values = getSortedValues();