Dart: Removes need to call listen().

mojo/public/dart/src/application_connection.dart

Index: mojo/public/dart/src/application_connection.dart
diff --git a/mojo/public/dart/src/application_connection.dart b/mojo/public/dart/src/application_connection.dart
index 5d98896ce60660131df841c6cab68b23efd7d393..7c8bdb95b729bc0e4a60e3678a6ebc1e62ebec6c 100644
--- a/mojo/public/dart/src/application_connection.dart
+++ b/mojo/public/dart/src/application_connection.dart
@@ -14,21 +14,15 @@ class LocalServiceProvider implements ServiceProvider {
   ServiceProviderStub _stub;
 
   LocalServiceProvider(this.connection, this._stub) {
+    assert(_stub.isOpen);
     _stub.impl = this;
   }
 
-  listen({Function onClosed}) => _stub.listen(onClosed: _closer(onClosed));
-
-  Function _closer(Function onClosed) {
-    return (() {
-      if (onClosed != null) {
-        onClosed();
-      }
-      close();
-    });
+  set onError(Function f) {
+    _stub.onError = f;
   }
 
-  void close({bool nodefer: false}) => _stub.close(nodefer: nodefer);
+  void close({bool nodefer : false}) => _stub.close(nodefer: nodefer);
 
   void connectToService(String interfaceName,
       core.MojoMessagePipeEndpoint pipe) {
@@ -72,15 +66,17 @@ class ApplicationConnection {
   LocalServiceProvider _localServiceProvider;
   final _nameToServiceFactory = new Map<String, ServiceFactory>();
   FallbackServiceFactory _fallbackServiceFactory;
+  core.ErrorHandler onError;
 
-  ApplicationConnection(ServiceProviderStub stub, ServiceProviderProxy proxy)
-      : remoteServiceProvider = proxy {
-    if (stub != null) _localServiceProvider =
-        new LocalServiceProvider(this, stub);
+  ApplicationConnection(ServiceProviderStub stub, this.remoteServiceProvider) {
+    if (stub != null) {
+      _localServiceProvider = new LocalServiceProvider(this, stub);
+      _localServiceProvider.onError = _errorHandler;
+    }
   }
 
   FallbackServiceFactory get fallbackServiceFactory => _fallbackServiceFactory;
-  set fallbackServiceFactory(FallbackServiceFactory f) {
+                         set fallbackServiceFactory(FallbackServiceFactory f) {
     assert(_localServiceProvider != null);
     _fallbackServiceFactory = f;
   }
@@ -100,18 +96,9 @@ class ApplicationConnection {
     _nameToServiceFactory[interfaceName] = factory;
   }
 
-  void listen({Function onClosed}) {
-    assert(_localServiceProvider != null);
-    _localServiceProvider.listen(onClosed: _closer(onClosed));
-  }
-
-  Function _closer(Function onClosed) {
-    return (() {
-      if (onClosed != null) {
-        onClosed();
-      }
-      close();
-    });
+  void _errorHandler() {
+    if (onError != null) onError();
+    close();
   }
 
   void close({bool nodefer: false}) {