convert completion tests to use new analysis driver

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

Index: pkg/analysis_server/test/services/completion/dart/named_constructor_contributor_test.dart
diff --git a/pkg/analysis_server/test/services/completion/dart/named_constructor_contributor_test.dart b/pkg/analysis_server/test/services/completion/dart/named_constructor_contributor_test.dart
index 17b5f7cb2b3b86722a8cb75429fe7b06003853ce..dd01394dd3c2b905df4a2a923261cc8c6645fd66 100644
--- a/pkg/analysis_server/test/services/completion/dart/named_constructor_contributor_test.dart
+++ b/pkg/analysis_server/test/services/completion/dart/named_constructor_contributor_test.dart
@@ -57,10 +57,7 @@ class NamedConstructorContributorTest extends DartCompletionContributorTest {
         import "/testB.dart";
         var m;
         main() {new X.^}''');
-    // Assume that imported libraries are resolved
-    if (!enableNewAnalysisDriver) {
-      await resolveLibraryUnit(libSource);
-    }
+
     await computeSuggestions();
     expect(replacementOffset, completionOffset);
     expect(replacementLength, 0);
@@ -113,10 +110,7 @@ class NamedConstructorContributorTest extends DartCompletionContributorTest {
         import "/testB.dart";
         var m;
         main() {new X.^}''');
-    // Assume that imported libraries are resolved
-    if (!enableNewAnalysisDriver) {
-      await resolveLibraryUnit(libSource);
-    }
+
     await computeSuggestions();
     expect(replacementOffset, completionOffset);
     expect(replacementLength, 0);