Make pub warning-clean.

utils/tests/pub/io_test.dart

Index: utils/tests/pub/io_test.dart
diff --git a/utils/tests/pub/io_test.dart b/utils/tests/pub/io_test.dart
index 585d068b2e1127db5bd4e7a70c0ee8cc01ebd786..7ca3176a5fd71dd49b0dbb2612a3f512d2a3cf98 100644
--- a/utils/tests/pub/io_test.dart
+++ b/utils/tests/pub/io_test.dart
@@ -190,17 +190,17 @@ void testExistencePredicate(String name, bool predicate(String path),
   group(name, () {
     test('returns $forFile for a file', () {
       expect(withTempDir((temp) {
-        var path = path.join(temp, "test.txt");
-        writeTextFile(path, "contents");
-        expect(predicate(path), equals(forFile));
+        var file = path.join(temp, "test.txt");
+        writeTextFile(file, "contents");
+        expect(predicate(file), equals(forFile));
       }), completes);
     });
 
     test('returns $forDirectory for a directory', () {
       expect(withTempDir((temp) {
-        var path = path.join(temp, "dir");
-        createDir(path);
-        expect(predicate(path), equals(forDirectory));
+        var file = path.join(temp, "dir");
+        createDir(file);
+        expect(predicate(file), equals(forDirectory));
       }), completes);
     });