Remove deprecated string features.

tests/standalone/io/string_stream_test.dart

Index: tests/standalone/io/string_stream_test.dart
diff --git a/tests/standalone/io/string_stream_test.dart b/tests/standalone/io/string_stream_test.dart
index 4ef05349556e01b77c90265a3da162765c6429bb..ec3dcb962d9731121d5c7d7c561522c0798a0a61 100644
--- a/tests/standalone/io/string_stream_test.dart
+++ b/tests/standalone/io/string_stream_test.dart
@@ -104,7 +104,7 @@ void testReadLine1() {
 
   stream.onData = stringData;
   stream.onClosed = streamClosed;
-  s.write("Line".charCodes);
+  s.write("Line".codeUnits);
 }
 
 void testReadLine2() {
@@ -128,7 +128,7 @@ void testReadLine2() {
       Expect.equals(2, stream.available());
       Expect.equals(null, line);
       stage++;
-      s.write("ne4\n".charCodes);
+      s.write("ne4\n".codeUnits);
     } else if (stage == 1) {
       Expect.equals(6, stream.available());
       line = stream.readLine();
@@ -137,7 +137,7 @@ void testReadLine2() {
       line = stream.readLine();
       Expect.equals(null, line);
       stage++;
-      s.write("\n\n\r\n\r\n\r\r".charCodes);
+      s.write("\n\n\r\n\r\n\r\r".codeUnits);
     } else if (stage == 2) {
       // Expect 5 empty lines. As long as the stream is not closed the
       // final \r cannot be interpreted as a end of line.
@@ -169,7 +169,7 @@ void testReadLine2() {
 
   stream.onLine = stringData;
   stream.onClosed = streamClosed;
-  s.write("Line1\nLine2\r\nLine3\rLi".charCodes);
+  s.write("Line1\nLine2\r\nLine3\rLi".codeUnits);
 }
 
 void testReadChunks() {
@@ -205,7 +205,7 @@ void testReadChunks() {
     Expect.equals(0, stream.available());
   }
 
-  s.write("ABCD1234".charCodes);
+  s.write("ABCD1234".codeUnits);
   stream.onData = stringData;
 }
 
@@ -231,7 +231,7 @@ void testReadMixed() {
       Expect.equals(null, data);
       data = stream.read(4);
       Expect.equals("1234", data);
-      s.write("A\r\nBCD\n1234".charCodes);
+      s.write("A\r\nBCD\n1234".codeUnits);
       stage++;
     } else if (stage == 1) {
       Expect.equals(11, stream.available());
@@ -250,7 +250,7 @@ void testReadMixed() {
       Expect.equals(null, data);
       data = stream.read(4);
       Expect.equals("1234", data);
-      s.write("A\r\nBCD\n1234".charCodes);
+      s.write("A\r\nBCD\n1234".codeUnits);
       stage++;
     } else if (stage == 2) {
       Expect.equals(11, stream.available());
@@ -271,7 +271,7 @@ void testReadMixed() {
     Expect.equals(true, stream.closed);
   }
 
-  s.write("A\r\nBCD\n1234".charCodes);
+  s.write("A\r\nBCD\n1234".codeUnits);
   stream.onData = stringData;
   stream.onClosed = streamClosed;
 }