cleanup dart code completion contributors

pkg/analysis_server/lib/src/services/completion/dart/named_constructor_contributor.dart

Index: pkg/analysis_server/lib/src/services/completion/dart/named_constructor_contributor.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/dart/named_constructor_contributor.dart b/pkg/analysis_server/lib/src/services/completion/dart/named_constructor_contributor.dart
index d473088b8215ef0c65a616c8ce230e6de75404d5..9f6614dcb2f78cff5417fe07b9bc9b2fa9747781 100644
--- a/pkg/analysis_server/lib/src/services/completion/dart/named_constructor_contributor.dart
+++ b/pkg/analysis_server/lib/src/services/completion/dart/named_constructor_contributor.dart
@@ -22,27 +22,6 @@ class NamedConstructorContributor extends DartCompletionContributor {
   @override
   Future<List<CompletionSuggestion>> computeSuggestions(
       DartCompletionRequest request) async {
-    // Determine if the target looks like a named constructor.
-    AstNode parsedNode = request.target.containingNode;
-    SimpleIdentifier targetId;
-    if (parsedNode is ConstructorName) {
-      TypeName type = parsedNode.type;
-      if (type != null) {
-        targetId = type.name;
-      }
-    } else if (parsedNode is PrefixedIdentifier) {
-      // Some PrefixedIdentifier nodes are transformed into
-      // ConstructorName nodes during the resolution process.
-      targetId = parsedNode.prefix;
-    }
-    if (targetId == null) {
-      return EMPTY_LIST;
-    }
-
-    // Resolve the target to determine the type
-    await request.resolveContainingExpression(targetId);
-
-    // Recompute the target since resolution may have changed it
     AstNode node = request.target.containingNode;
     LibraryElement libElem = request.libraryElement;
     if (libElem == null) {