Make Analysis Server tests use MockSdk again.

pkg/analysis_server/test/services/correction/fix_test.dart

Index: pkg/analysis_server/test/services/correction/fix_test.dart
diff --git a/pkg/analysis_server/test/services/correction/fix_test.dart b/pkg/analysis_server/test/services/correction/fix_test.dart
index 753c685f6e2806970692865cab48355cf38f0d08..c90e147250a6a7bffde1347d847a22f5a686dacd 100644
--- a/pkg/analysis_server/test/services/correction/fix_test.dart
+++ b/pkg/analysis_server/test/services/correction/fix_test.dart
@@ -4287,12 +4287,8 @@ void process(List<int> items) {
     _assertLinkedGroup(
         change.linkedEditGroups[2],
         ['List<int> items) {'],
-        expectedSuggestions(LinkedEditSuggestionKind.TYPE, [
-          'List<int>',
-          'EfficientLengthIterable<int>',
-          'Iterable<int>',
-          'Object'
-        ]));
+        expectedSuggestions(LinkedEditSuggestionKind.TYPE,
+            ['List<int>', 'Iterable<int>', 'Object']));
   }
 
   test_undefinedFunction_create_importType() async {
@@ -4931,7 +4927,7 @@ class A {
         change.linkedEditGroups[index++],
         ['String s'],
         expectedSuggestions(LinkedEditSuggestionKind.TYPE,
-            ['String', 'Object', 'Comparable<String>', 'Pattern']));
+            ['String', 'Object', 'Comparable<String>']));
     _assertLinkedGroup(change.linkedEditGroups[index++], ['s)']);
   }
 
@@ -4975,7 +4971,7 @@ class A {
         change.linkedEditGroups[index++],
         ['String ccc'],
         expectedSuggestions(LinkedEditSuggestionKind.TYPE,
-            ['String', 'Object', 'Comparable<String>', 'Pattern']));
+            ['String', 'Object', 'Comparable<String>']));
   }
 
   test_undefinedMethod_createUnqualified_returnType() async {