message: Mark "removeAt" with CanIgnoreReturnValue.
diff: @@ -249,6 +249,7 @@ public final class KeysetHandle {
  * @deprecated Use {@link #deleteAt} or {@link #getAt} instead.
  */
  @Deprecated
  + @CanIgnoreReturnValue
  public Builder.Entry removeAt(int i) {
  return entries.remove(i);
  }
  @@ -929,7 +930,7 @@ public final class KeysetHandle {
  @SuppressWarnings("deprecation")
  private static void validate(KeyData keyData) throws GeneralSecurityException {
  // This will throw GeneralSecurityException if the keyData is invalid.
  - Registry.getPrimitive(keyData);
  + Object unused = Registry.getPrimitive(keyData);
  }
  /**
  