Change ScheduledProcess's output streams over to be ScheduledStreams.

This will help test "pub serve" with multiple entrypoints.

R=rnystrom@google.com
BUG=

Review URL: https://codereview.chromium.org//164773003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/watcher@32770 260f80e4-7a28-3924-810f-c04153c831b5

pkgs/watcher/pubspec.yaml

diff --git a/pkgs/watcher/pubspec.yaml b/pkgs/watcher/pubspec.yaml
index bf00d9e..1045bc5 100644
--- a/pkgs/watcher/pubspec.yaml
+++ b/pkgs/watcher/pubspec.yaml
@@ -9,7 +9,7 @@
   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"