linter: Remove unnecessary canonincalization test

This test was added when the linter binary existed and did some of it's
own library / path / URI resolution.

Change-Id: Id529b8d8eb2ff6550b1281f58f5c613f7ce1ce42
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/390664
Reviewed-by: Phil Quitslund <[email protected]>
Commit-Queue: Samuel Rawlins <[email protected]>

Author: srawlins

pkg/linter/test/all.dart

@@ -6,7 +6,6 @@ import 'package:analyzer/src/lint/io.dart';
 
 import 'annotation_test.dart' as annotation;
 import 'ascii_utils_test.dart' as ascii_utils;
-import 'canonicalization_test.dart' as canonicalization;
 import 'doc_test.dart' as doc;
 import 'engine_test.dart' as engine;
 import 'formatter_test.dart' as formatter;
@@ -34,7 +33,6 @@ void main() {
 
   annotation.main();
   ascii_utils.main();
-  canonicalization.main();
   doc.main();
   engine.main();
   formatter.main();