Update two more suppressions

Author: zbynek

user/super/com/google/gwt/emul/java/io/Serializable.java

@@ -25,8 +25,9 @@
  * The Java serialization protocol is explicitly not supported.
  */
 public interface Serializable {
-  // CHECKSTYLE_OFF: Utility methods.
+
   @JsMethod
+  @SuppressWarnings("checkstyle:MethodName")
   static boolean $isInstance(HasSerializableTypeMarker instance) {
     if (instance == null) {
       return false;
@@ -40,5 +41,4 @@ public interface Serializable {
         // Arrays are implicitly instances of Serializable (JLS 10.7).
         || ArrayHelper.isArray(instance);
   }
-  // CHECKSTYLE_ON: end utility methods
 }

user/super/com/google/gwt/emul/java/lang/CharSequence.java

@@ -90,14 +90,13 @@ static int compare(CharSequence cs1, CharSequence cs2) {
     return cs1.toString().compareTo(cs2.toString());
   }
 
-  // CHECKSTYLE_OFF: Utility methods.
   @JsMethod
+  @SuppressWarnings("checkstyle:MethodName")
   static boolean $isInstance(HasCharSequenceTypeMarker instance) {
     if (JsUtils.typeOf(instance).equals("string")) {
       return true;
     }
 
     return instance != null && instance.getTypeMarker() == true;
   }
-  // CHECKSTYLE_ON: end utility methods
 }