Fix a couple of warnings.

R=nweiz@google.com

Review URL: https://codereview.chromium.org//15902002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@23098 260f80e4-7a28-3924-810f-c04153c831b5

test/test_pub.dart

@@ -104,8 +104,6 @@ void serve([List<d.Descriptor> contents]) {
           var response = request.response;
           try {
             var path = request.uri.path.replaceFirst("/", "");
-
-            if (_requestedPaths == null) _requestedPaths = <String>[];
             _requestedPaths.add(path);
 
             response.persistentConnection = false;

test/version_solver_test.dart

@@ -825,7 +825,7 @@ _testResolve(void testFn(String description, Function body),
           // remote server.
           root = package;
         } else {
-          cache.sources[source].addPackage(name, package);
+          (cache.sources[source] as MockSource).addPackage(name, package);
         }
       });
     });