Change the process API to be completely asynchronous.

samples/total/src/Dartc.dart

Index: samples/total/src/Dartc.dart
diff --git a/samples/total/src/Dartc.dart b/samples/total/src/Dartc.dart
index c8dedc9b67790d3f77dd19a7d951db17cd8c0747..231ac06a9ca910a9e610f4eaffefaa27b5cbc6a4 100644
--- a/samples/total/src/Dartc.dart
+++ b/samples/total/src/Dartc.dart
@@ -46,15 +46,12 @@ class Dartc {
     }
     args.add(scriptName);
 
-    Process compiler = new Process(DARTC_EXEC_PATH, args);
-
+    Process compiler = new Process.start(DARTC_EXEC_PATH, args);
     StringBuffer messages = new StringBuffer();
     compiler.exitHandler = (int status) {
-        compiler.close();
-        callback(status, messages.toString());
-      };
-
-    compiler.start();
+      compiler.close();
+      callback(status, messages.toString());
+    };
 
     compiler.stdout.dataHandler = () => _readAll(compiler.stdout, messages);
     compiler.stderr.dataHandler = () => _readAll(compiler.stderr, messages);