Rename blahHandler to onBlah throughout dart:io.

samples/total/server/DartCompiler.dart

Index: samples/total/server/DartCompiler.dart
diff --git a/samples/total/server/DartCompiler.dart b/samples/total/server/DartCompiler.dart
index b5f8ccb62f79861823a5b64a8e3351097efc59c1..506409f70b531251dff88ea6cc80c2d8474a01f8 100644
--- a/samples/total/server/DartCompiler.dart
+++ b/samples/total/server/DartCompiler.dart
@@ -59,13 +59,13 @@ class DartCompiler {
 
     Process compiler = new Process.start(_frogExecPath, args);
     StringBuffer messages = new StringBuffer();
-    compiler.exitHandler = (int status) {
+    compiler.onExit = (int status) {
       compiler.close();
       callback(status, messages.toString());
     };
 
-    compiler.stdout.dataHandler = () => _readAll(compiler.stdout, messages);
-    compiler.stderr.dataHandler = () => _readAll(compiler.stderr, messages);
+    compiler.stdout.onData = () => _readAll(compiler.stdout, messages);
+    compiler.stderr.onData = () => _readAll(compiler.stderr, messages);
   }
 }