package barback: Update the comment style generic syntax.

lib/src/asset/asset_node.dart

Index: lib/src/asset/asset_node.dart
diff --git a/lib/src/asset/asset_node.dart b/lib/src/asset/asset_node.dart
index 4924bbf21bd907a1579964ddbe60c14c0e29285a..629599c06ed7e6112f6aa52b4e8ee56fab10b5ce 100644
--- a/lib/src/asset/asset_node.dart
+++ b/lib/src/asset/asset_node.dart
@@ -83,7 +83,7 @@ class AssetNode {
   /// The return value of [callback] is piped to the returned Future. If the
   /// asset is removed before becoming available, the returned future will throw
   /// an [AssetNotFoundException].
-  Future/*<T>*/ whenAvailable/*<T>*/(/*=T*/ callback(Asset asset)) {
+  Future<T> whenAvailable<T>(T callback(Asset asset)) {
     return _waitForState((state) => state.isAvailable || state.isRemoved,
         (state) {
       if (state.isRemoved) throw new AssetNotFoundException(id);
@@ -114,9 +114,8 @@ class AssetNode {
   /// [callback] is called synchronously if this is already in such a state.
   ///
   /// The return value of [callback] is piped to the returned Future.
-  Future/*<T>*/ _waitForState/*<T>*/(
-      bool test(AssetState state),
-      /*=T*/ callback(AssetState state)) {
+  Future<T> _waitForState<T>(
+      bool test(AssetState state), T callback(AssetState state)) {
     if (test(state)) return new Future.sync(() => callback(state));
     return onStateChange.firstWhere(test).then((_) => callback(state));
   }