Fix build failure with Bazel 0.5rc3.

  both method assertThat(Iterable<?>) in Truth and method <T>assertThat(T) in Truth match
  where T is a type-variable:
    T extends Comparable<?> declared in method <T>assertThat(T)

Change-Id: I8a938ace1917d867efd59c6e43ecaf8a7998dafc
diff --git a/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/api/accounts/AccountIT.java b/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/api/accounts/AccountIT.java
index a3ca832..8478d1c 100644
--- a/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/api/accounts/AccountIT.java
+++ b/gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/api/accounts/AccountIT.java
@@ -1001,9 +1001,9 @@
     return new String(out.toByteArray(), UTF_8);
   }
 
-  @SuppressWarnings({"unchecked", "rawtypes"})
-  private static void assertIteratorSize(int size, Iterator it) {
-    assertThat(ImmutableList.copyOf(it)).hasSize(size);
+  private static void assertIteratorSize(int size, Iterator<?> it) {
+    List<?> lst = ImmutableList.copyOf(it);
+    assertThat(lst).hasSize(size);
   }
 
   private static void assertKeyMapContains(TestKey expected, Map<String, GpgKeyInfo> actualMap) {