Rename blahHandler to onBlah throughout dart:io.

samples/total/server/TotalRunner.dart

Index: samples/total/server/TotalRunner.dart
diff --git a/samples/total/server/TotalRunner.dart b/samples/total/server/TotalRunner.dart
index 411b815981904a2d95194cfb92f7dcc2447798f4..20f668d34d7b1609f63bea0cb637a3c78ceb405f 100755
--- a/samples/total/server/TotalRunner.dart
+++ b/samples/total/server/TotalRunner.dart
@@ -56,13 +56,13 @@ class ServerRunner {
     }
     Process dart = new Process.start(foundExec, [_serverMain]);
 
-    dart.exitHandler = (int status) {
+    dart.onExit = (int status) {
       dart.close();
       exitCallback(status, this);
     };
 
-    dart.stdout.dataHandler = () => readMore(dart.stdout, new StringBuffer());
-    dart.stderr.dataHandler = () => readMore(dart.stderr, new StringBuffer());
+    dart.stdout.onData = () => readMore(dart.stdout, new StringBuffer());
+    dart.stderr.onData = () => readMore(dart.stderr, new StringBuffer());
   }
 
   void readMore(InputStream i, StringBuffer readSoFar) {