The FLX package should test itself

Rather than using the Flutter unit tests to test FLX, we can just test FLX
directly. Also, clean up the dependencies in the pubspec to match the code.

packages/flx/pubspec.yaml

@@ -4,12 +4,13 @@ author: Flutter Authors <flutter-dev@googlegroups.com>
 description: Library for dealing with Flutter bundle (.flx) files
 homepage: https://github.com/flutter/flutter/tree/master/packages/flx
 dependencies:
+  bignum: ^0.0.7
   asn1lib: ^0.4.1
   cipher: ^0.7.1
   crypto: ^0.9.1
-  path: ^1.3.0
-  sky_services: 0.0.50
-  yaml: ^2.1.3
 
 environment:
   sdk: '>=1.12.0 <2.0.0'
+
+dev_dependencies:
+  test: ^0.12.5

packages/unit/test/flx/bundle_test.dart → packages/flx/test/bundle_test.dart

 import 'dart:convert' hide BASE64;
-import 'dart:typed_data';
 import 'dart:io';
+import 'dart:typed_data';
 
 import 'package:crypto/crypto.dart';
-import 'package:flx/signing.dart';
 import 'package:flx/bundle.dart';
-import 'package:path/path.dart' as path;
+import 'package:flx/signing.dart';
 import 'package:test/test.dart';
 
 main() async {
@@ -26,7 +25,7 @@ main() async {
 
   // Create a temp dir and file for the bundle.
   Directory tempDir = await Directory.systemTemp.createTempSync('bundle_test');
-  String bundlePath = path.join(tempDir.path, 'bundle.flx');
+  String bundlePath = tempDir.path + '/bundle.flx';
 
   AsymmetricKeyPair keyPair = keyPairFromPrivateKeyBytes(kPrivateKeyDER);
   Map<String, dynamic> manifest = JSON.decode(UTF8.decode(

packages/updater/lib/main.dart

@@ -3,10 +3,7 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:convert';
-import 'dart:math';
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:mojo/core.dart';
 import 'package:flutter/services.dart';

travis/setup.sh

@@ -4,8 +4,9 @@ set -ex
 pub global activate tuneup
 
 (cd packages/cassowary; pub get)
-(cd packages/newton; pub get)
 (cd packages/flutter_tools; pub get)
+(cd packages/flx; pub get)
+(cd packages/newton; pub get)
 (cd packages/unit; pub get)
 
 ./travis/download_tester.py packages/unit/packages/sky_engine/REVISION bin/cache/travis/out/Debug

travis/test.sh

@@ -2,6 +2,8 @@
 set -ex
 
 (cd packages/cassowary; pub global run tuneup check; pub run test -j1)
-(cd packages/newton; pub global run tuneup check; pub run test -j1)
 (cd packages/flutter_tools; pub global run tuneup check; pub run test -j1)
+(cd packages/flx; pub global run tuneup check; pub run test -j1)
+(cd packages/newton; pub global run tuneup check; pub run test -j1)
+
 ./dev/run_tests --engine-dir bin/cache/travis