Change ScheduledProcess's output streams over to be ScheduledStreams.

pkg/watcher/pubspec.yaml

Index: pkg/watcher/pubspec.yaml
diff --git a/pkg/watcher/pubspec.yaml b/pkg/watcher/pubspec.yaml
index bf00d9e31fdc54a1835ebb05ae60db94b008e2c4..1045bc56b48c20a472171eb9a8c27ddb39e13c81 100644
--- a/pkg/watcher/pubspec.yaml
+++ b/pkg/watcher/pubspec.yaml
@@ -9,7 +9,7 @@ dependencies:
   path: ">=0.9.0 <2.0.0"
   stack_trace: ">=0.9.1 <0.10.0"
 dev_dependencies:
-  scheduled_test: ">=0.9.3-dev <0.10.0"
+  scheduled_test: ">=0.9.3-dev <0.11.0"
   unittest: ">=0.9.2 <0.10.0"
 environment:
   sdk: ">=0.8.10+6 <2.0.0"