Remove deprecated string features.

tests/language/string_escapes_test.dart

Index: tests/language/string_escapes_test.dart
diff --git a/tests/language/string_escapes_test.dart b/tests/language/string_escapes_test.dart
index 20a7beb4f77f22343efbfc43537ae25afc443c20..6e802142c76563e5be20d0149df6e1bda22eac48 100644
--- a/tests/language/string_escapes_test.dart
+++ b/tests/language/string_escapes_test.dart
@@ -15,43 +15,43 @@ class StringEscapesTest {
   static testDelimited() {
     String str = "Foo\u{1}Bar\u{000001}Baz\u{D7FF}Boo";
     Expect.equals(15, str.length);
-    Expect.equals(1, str.charCodeAt(3));
-    Expect.equals(1, str.charCodeAt(7));
-    Expect.equals(0xD7FF, str.charCodeAt(11));
-    Expect.equals('B'.charCodeAt(0), str.charCodeAt(12));
+    Expect.equals(1, str.codeUnitAt(3));
+    Expect.equals(1, str.codeUnitAt(7));
+    Expect.equals(0xD7FF, str.codeUnitAt(11));
+    Expect.equals('B'.codeUnitAt(0), str.codeUnitAt(12));
   }
 
   static testEscapes() {
     String str = "Foo\fBar\vBaz\bBoo";
     Expect.equals(15, str.length);
-    Expect.equals(12, str.charCodeAt(3));
-    Expect.equals('B'.charCodeAt(0), str.charCodeAt(4));
-    Expect.equals(11, str.charCodeAt(7));
-    Expect.equals('z'.charCodeAt(0), str.charCodeAt(10));
-    Expect.equals(8, str.charCodeAt(11));
-    Expect.equals('o'.charCodeAt(0), str.charCodeAt(14));
+    Expect.equals(12, str.codeUnitAt(3));
+    Expect.equals('B'.codeUnitAt(0), str.codeUnitAt(4));
+    Expect.equals(11, str.codeUnitAt(7));
+    Expect.equals('z'.codeUnitAt(0), str.codeUnitAt(10));
+    Expect.equals(8, str.codeUnitAt(11));
+    Expect.equals('o'.codeUnitAt(0), str.codeUnitAt(14));
     str = "Abc\rDef\nGhi\tJkl";
     Expect.equals(15, str.length);
-    Expect.equals(13, str.charCodeAt(3));
-    Expect.equals('D'.charCodeAt(0), str.charCodeAt(4));
-    Expect.equals(10, str.charCodeAt(7));
-    Expect.equals('G'.charCodeAt(0), str.charCodeAt(8));
-    Expect.equals(9, str.charCodeAt(11));
-    Expect.equals('J'.charCodeAt(0), str.charCodeAt(12));
+    Expect.equals(13, str.codeUnitAt(3));
+    Expect.equals('D'.codeUnitAt(0), str.codeUnitAt(4));
+    Expect.equals(10, str.codeUnitAt(7));
+    Expect.equals('G'.codeUnitAt(0), str.codeUnitAt(8));
+    Expect.equals(9, str.codeUnitAt(11));
+    Expect.equals('J'.codeUnitAt(0), str.codeUnitAt(12));
   }
 
   static testFixed2() {
     String str = "Foo\xFFBar";
     Expect.equals(7, str.length);
-    Expect.equals(255, str.charCodeAt(3));
-    Expect.equals('B'.charCodeAt(0), str.charCodeAt(4));
+    Expect.equals(255, str.codeUnitAt(3));
+    Expect.equals('B'.codeUnitAt(0), str.codeUnitAt(4));
   }
 
   static testFixed4() {
     String str = "Foo\u0001Bar";
     Expect.equals(7, str.length);
-    Expect.equals(1, str.charCodeAt(3));
-    Expect.equals('B'.charCodeAt(0), str.charCodeAt(4));
+    Expect.equals(1, str.codeUnitAt(3));
+    Expect.equals('B'.codeUnitAt(0), str.codeUnitAt(4));
   }
 
   static testLiteral() {