Make isEmpty a getter.

tests/corelib/string_buffer_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // TODO(srdjan): Move StringBuffer to visible names.
 
 class StringBufferTest {
   static testConstructor() {
     StringBuffer bf = new StringBuffer("");
-    Expect.equals(true, bf.isEmpty());
+    Expect.equals(true, bf.isEmpty);
 
     bf = new StringBuffer("abc");
     Expect.equals(3, bf.length);
     Expect.equals("abc", bf.toString());
   }
 
   static testAdd() {
     StringBuffer bf = new StringBuffer("");
-    Expect.equals(true, bf.isEmpty());
+    Expect.equals(true, bf.isEmpty);
 
     bf.add("a");
     Expect.equals(1, bf.length);
     Expect.equals("a", bf.toString());
 
     bf = new StringBuffer("");
     bf.add("a");
     bf.add("b");
     Expect.equals("ab", bf.toString());
 
@@ skipping 43 matching lines @@
     bf.add("foo");
     Expect.equals(3, bf.length);
     bf.add("bar");
     Expect.equals(6, bf.length);
     bf.add("");
     Expect.equals(6, bf.length);
   }
 
   static testIsEmpty() {
     StringBuffer bf = new StringBuffer("");
-    Expect.equals(true, bf.isEmpty());
+    Expect.equals(true, bf.isEmpty);
     bf.add("foo");
-    Expect.equals(false, bf.isEmpty());
+    Expect.equals(false, bf.isEmpty);
   }
 
   static testAddAll() {
     StringBuffer bf = new StringBuffer("");
     bf.addAll(["foo", "bar", "a", "b", "c"]);
     Expect.equals("foobarabc", bf.toString());
 
     bf.addAll([]);
     Expect.equals("foobarabc", bf.toString());
 
@@ skipping 52 matching lines @@
     testAdd();
     testAddAll();
     testClear();
     testChaining();
   }
 }
 
 main() {
   StringBufferTest.testMain();
 }