Roll analyzer to 0.27.2-alpha.1

test/codegen/expect/expect/expect.js

Index: test/codegen/expect/expect/expect.js
diff --git a/test/codegen/expect/expect/expect.js b/test/codegen/expect/expect/expect.js
index 255484817caa4f68d1ad60f175e9b3c0c275a47f..ea30b255c9451acf549b6aa0661c3b93a0e38b65 100644
--- a/test/codegen/expect/expect/expect.js
+++ b/test/codegen/expect/expect/expect.js
@@ -56,7 +56,7 @@ dart_library.library('expect/expect', null, /* Imports */[
       if (dart.equals(expected, actual)) return;
       let msg = Expect._getMessage(reason);
       if (typeof expected == 'string' && typeof actual == 'string') {
-        let stringDifference = Expect._stringDifference(dart.as(expected, core.String), dart.as(actual, core.String));
+        let stringDifference = Expect._stringDifference(expected, actual);
         if (stringDifference != null) {
           Expect._fail(`Expect.equals(${stringDifference}${msg}) fails.`);
         }