Merge pull request flutter#13 from dart-lang/fix-tests

Fix Travis

Author: nex3

.travis.yml

@@ -1,14 +1,10 @@
 language: dart
 sudo: false
-dart:
-  - dev
-  - stable
+dart: dev
 
 dart_task:
   - test: --platform vm
   - test: --platform firefox -j 1
-  - test: --platform dartium
-    install_dartium: true
   - dartanalyzer
 
 matrix: