Fix part related completion tests with the new analysis driver.

pkg/analysis_server/test/services/completion/dart/library_member_contributor_test.dart

Index: pkg/analysis_server/test/services/completion/dart/library_member_contributor_test.dart
diff --git a/pkg/analysis_server/test/services/completion/dart/library_member_contributor_test.dart b/pkg/analysis_server/test/services/completion/dart/library_member_contributor_test.dart
index 5e1e42017f18ef9527c0766fd26824eddf1ec4c3..fe1e24b8ddb16b32ffc23605283d094a5a74e7f7 100644
--- a/pkg/analysis_server/test/services/completion/dart/library_member_contributor_test.dart
+++ b/pkg/analysis_server/test/services/completion/dart/library_member_contributor_test.dart
@@ -275,25 +275,4 @@ class LibraryMemberContributorTest extends DartCompletionContributorTest {
 class LibraryMemberContributorTest_Driver extends LibraryMemberContributorTest {
   @override
   bool get enableNewAnalysisDriver => true;
-
-  @failingTest
-  @override
-  test_libraryPrefix_deferred() {
-//    'package:analyzer/src/dart/element/element.dart': Failed assertion: line 5729 pos 12: '_loadLibraryFunction != null' is not true.
-    return super.test_libraryPrefix_deferred_inPart();
-  }
-
-  @failingTest
-  @override
-  test_libraryPrefix_deferred_inPart() {
-    // Bad state: Should not be used with the new analysis driver.
-    return super.test_libraryPrefix_deferred_inPart();
-  }
-
-  @failingTest
-  @override
-  test_PrefixedIdentifier_library_inPart() {
-    // Bad state: Should not be used with the new analysis driver.
-    return super.test_PrefixedIdentifier_library_inPart();
-  }
 }