Remove upper case constants (flutter#17)

* Remove usage of upper-case constants.

* update SDK version
* remove stable from Travis config

Author: lrhn

.travis.yml

@@ -2,8 +2,6 @@ language: dart
 
 dart:
   - dev
-  - stable
-
 dart_task:
   - test: --platform vm
   - test: --platform firefox -j 1

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.6.7
+
+* Update SDK version to 2.0.0-dev.17.0.
+
 ## 1.6.6
 
 * Fix a Dart 2 issue with inner stream transformation in `GuaranteeChannel`.

pubspec.yaml

@@ -1,10 +1,10 @@
 name: stream_channel
-version: 1.6.6
+version: 1.6.7-dev
 description: An abstraction for two-way communication channels.
 author: Dart Team <[email protected]>
 homepage: https://github.com/dart-lang/stream_channel
 environment:
-  sdk: '>=1.21.0 <2.0.0'
+  sdk: '>=2.0.0-dev.17.0 <2.0.0'
 dependencies:
   async: '>=1.11.0 <3.0.0'
   stack_trace: '^1.0.0'

test/json_document_transformer_test.dart

@@ -29,7 +29,7 @@ void main() {
     var transformed = channel.transform(jsonDocument);
     transformed.sink.add({"foo": "bar"});
     expect(sinkController.stream.first,
-        completion(equals(JSON.encode({"foo": "bar"}))));
+        completion(equals(jsonEncode({"foo": "bar"}))));
   });
 
   test("supports the reviver function", () {

test/stream_channel_test.dart

@@ -43,7 +43,7 @@ void main() {
   test("transform() transforms the channel", () async {
     var transformed = channel
         .cast<List<int>>()
-        .transform(new StreamChannelTransformer.fromCodec(UTF8));
+        .transform(new StreamChannelTransformer.fromCodec(utf8));
 
     streamController.add([102, 111, 111, 98, 97, 114]);
     streamController.close();