Revert "Flush AST results for source outside of the analysis roots."

pkg/analysis_server/test/domain_completion_test.dart

Index: pkg/analysis_server/test/domain_completion_test.dart
diff --git a/pkg/analysis_server/test/domain_completion_test.dart b/pkg/analysis_server/test/domain_completion_test.dart
index fbd51f6eaa483103d73fbea342d77bec5e4294dd..81d8a353ac3b79acc58eda76eefa37231b298c33 100644
--- a/pkg/analysis_server/test/domain_completion_test.dart
+++ b/pkg/analysis_server/test/domain_completion_test.dart
@@ -310,7 +310,7 @@ class CompletionDomainHandlerTest extends AbstractCompletionDomainTest {
     expect(suggestions, isEmpty);
   }
 
-  fail_inDartDoc_reference1() async {
+  test_inDartDoc_reference1() async {
     addFile(
         '/testA.dart',
         '''
@@ -498,7 +498,7 @@ class B extends A {m() {^}}
     });
   }
 
-  fail_partFile2() {
+  test_partFile2() {
     addFile(
         '/testA.dart',
         '''