cleanup dart code completion contributors

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

Index: pkg/analysis_server/lib/src/services/completion/dart/local_library_contributor.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/dart/local_library_contributor.dart b/pkg/analysis_server/lib/src/services/completion/dart/local_library_contributor.dart
index 64bbd64f0f33a47af9602d6bf0f490de1d1a867e..ef044617237bc90d89baa5d325d7a5e585cb543f 100644
--- a/pkg/analysis_server/lib/src/services/completion/dart/local_library_contributor.dart
+++ b/pkg/analysis_server/lib/src/services/completion/dart/local_library_contributor.dart
@@ -181,21 +181,12 @@ class LocalLibraryContributor extends DartCompletionContributor {
       return EMPTY_LIST;
     }
 
-    List<CompilationUnitElement> libraryUnits = await request.resolveUnits();
+    List<CompilationUnitElement> libraryUnits =
+        request.result.unit.element.library.units;
     if (libraryUnits == null) {
       return EMPTY_LIST;
     }
 
-    AstNode node = request.target.containingNode;
-
-    // If the target is in an expression
-    // then resolve the outermost/entire expression
-    await request.resolveContainingExpression(node);
-
-    // Discard any cached target information
-    // because it may have changed as a result of the resolution
-    node = request.target.containingNode;
-
     OpType optype = (request as DartCompletionRequestImpl).opType;
     LibraryElementSuggestionBuilder visitor =
         new LibraryElementSuggestionBuilder(request, optype);