cleanup dart code completion contributors

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

Index: pkg/analysis_server/lib/src/services/completion/dart/type_member_contributor.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/dart/type_member_contributor.dart b/pkg/analysis_server/lib/src/services/completion/dart/type_member_contributor.dart
index e58bbc7b09220f9d49da90e1f92e07ed984dd2ad..4d83221e1ff7c1b034dd639b6d57d3c5ccbdc3f3 100644
--- a/pkg/analysis_server/lib/src/services/completion/dart/type_member_contributor.dart
+++ b/pkg/analysis_server/lib/src/services/completion/dart/type_member_contributor.dart
@@ -25,17 +25,8 @@ class TypeMemberContributor extends DartCompletionContributor {
   @override
   Future<List<CompletionSuggestion>> computeSuggestions(
       DartCompletionRequest request) async {
-    // Determine if the target looks like a prefixed identifier,
-    // a method invocation, or a property access
-    Expression parsedExpression = request.dotTarget;
-    if (parsedExpression == null) {
-      return EMPTY_LIST;
-    }
-
-    // Resolve the expression and the containing library
-    await request.resolveContainingExpression(parsedExpression);
     LibraryElement containingLibrary = request.libraryElement;
-    // Gracefully degrade if the library element could not be resolved
+    // Gracefully degrade if the library element is not resolved
     // e.g. detached part file or source change
     if (containingLibrary == null) {
       return EMPTY_LIST;