move import combinator suggestions into a separate computer

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

Index: pkg/analysis_server/lib/src/services/completion/imported_computer.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/imported_computer.dart b/pkg/analysis_server/lib/src/services/completion/imported_computer.dart
index 12e64e0a132728a82813fba017bbc19c818f94b3..73f972b6684d1b9954ffab2dbeb9e52870aaa537 100644
--- a/pkg/analysis_server/lib/src/services/completion/imported_computer.dart
+++ b/pkg/analysis_server/lib/src/services/completion/imported_computer.dart
@@ -79,11 +79,6 @@ class _ImportedVisitor extends GeneralizingAstVisitor<Future<bool>> {
   }
 
   @override
-  Future<bool> visitCombinator(Combinator node) {
-    return _addCombinatorSuggestions(node);
-  }
-
-  @override
   Future<bool> visitExpression(Expression node) {
     return _addImportedElementSuggestions(node, excludeVoidReturn: true);
   }
@@ -202,19 +197,6 @@ class _ImportedVisitor extends GeneralizingAstVisitor<Future<bool>> {
     return new Future.value(false);
   }
 
-  Future _addCombinatorSuggestions(Combinator node) {
-    var directive = node.getAncestor((parent) => parent is NamespaceDirective);
-    if (directive is NamespaceDirective) {
-      LibraryElement library = directive.uriElement;
-      LibraryElementSuggestionBuilder.suggestionsFor(
-          request,
-          CompletionSuggestionKind.IDENTIFIER,
-          library);
-      return new Future.value(true);
-    }
-    return new Future.value(false);
-  }
-
   void _addElementSuggestion(Element element, bool typesOnly,
       bool excludeVoidReturn, CompletionRelevance relevance) {