Completion should not show overridden inherited methods

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 e8da6efa37dc25faa45492c82bbf09995fbaa2c1..20315572da68d3f98689dc9653f781b119351e7e 100644
--- a/pkg/analysis_server/lib/src/services/completion/imported_computer.dart
+++ b/pkg/analysis_server/lib/src/services/completion/imported_computer.dart
@@ -80,14 +80,9 @@ class _ImportedSuggestionBuilder extends ElementSuggestionBuilder
   final DartCompletionRequest request;
   final OpType optype;
   DartCompletionCache cache;
-  HashSet<String> completions;
 
   _ImportedSuggestionBuilder(this.request, this.optype) {
     cache = request.cache;
-    completions = new HashSet<String>();
-    for (CompletionSuggestion suggestion in request.suggestions) {
-      completions.add(suggestion.completion);
-    }
   }
 
   @override
@@ -175,11 +170,11 @@ class _ImportedSuggestionBuilder extends ElementSuggestionBuilder
     unfiltered.forEach((CompletionSuggestion suggestion) {
       if (filterText.length > 0) {
         if (suggestion.completion.startsWith(filterText)) {
-          _addSuggestion(suggestion);
+          request.addSuggestion(suggestion);
         }
       } else {
         if (suggestion.relevance != DART_RELEVANCE_LOW) {
-          _addSuggestion(suggestion);
+          request.addSuggestion(suggestion);
         }
       }
     });
@@ -226,16 +221,6 @@ class _ImportedSuggestionBuilder extends ElementSuggestionBuilder
   }
 
   /**
-   * Add suggestion if an identically named suggestion
-   * has not already been added.
-   */
-  void _addSuggestion(CompletionSuggestion suggestion) {
-    if (completions.add(suggestion.completion)) {
-      request.suggestions.add(suggestion);
-    }
-  }
-
-  /**
    * Add suggested based upon imported elements.
    */
   void _addSuggestions(AstNode node) {