Completion should not show overridden inherited methods

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

Index: pkg/analysis_server/lib/src/services/completion/local_computer.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/local_computer.dart b/pkg/analysis_server/lib/src/services/completion/local_computer.dart
index 243d01207d4cd8c6a2b8b512d57e6e6a6c0ff8b6..028b11660757bb96077fd800ae5434aa3719cf78 100644
--- a/pkg/analysis_server/lib/src/services/completion/local_computer.dart
+++ b/pkg/analysis_server/lib/src/services/completion/local_computer.dart
@@ -5,7 +5,6 @@
 library services.completion.computer.dart.local;
 
 import 'dart:async';
-import 'dart:collection';
 
 import 'package:analysis_server/src/protocol.dart' as protocol
     show Element, ElementKind;
@@ -273,7 +272,7 @@ class _ConstructorVisitor extends LocalDeclarationVisitor {
         parameterTypes: parameterTypes,
         requiredParameterCount: requiredParameterCount,
         hasNamedParameters: hasNamedParameters);
-    request.suggestions.add(suggestion);
+    request.addSuggestion(suggestion);
     return suggestion;
   }
 
@@ -403,7 +402,7 @@ class _LabelVisitor extends LocalDeclarationVisitor {
         CompletionSuggestion suggestion = new CompletionSuggestion(
             CompletionSuggestionKind.IDENTIFIER, DART_RELEVANCE_DEFAULT,
             completion, completion.length, 0, false, false);
-        request.suggestions.add(suggestion);
+        request.addSuggestion(suggestion);
         return suggestion;
       }
     }
@@ -429,7 +428,6 @@ class _LabelVisitor extends LocalDeclarationVisitor {
 class _LocalVisitor extends LocalDeclarationVisitor {
   final DartCompletionRequest request;
   final OpType optype;
-  HashSet<String> completions = new HashSet();
 
   _LocalVisitor(this.request, int offset, this.optype) : super(offset);
 
@@ -668,10 +666,7 @@ class _LocalVisitor extends LocalDeclarationVisitor {
       bool isDeprecated, int defaultRelevance, {ClassDeclaration classDecl}) {
     if (id != null) {
       String completion = id.name;
-      if (completion != null &&
-          completion.length > 0 &&
-          completion != '_' &&
-          completions.add(completion)) {
+      if (completion != null && completion.length > 0 && completion != '_') {
         CompletionSuggestion suggestion = new CompletionSuggestion(
             CompletionSuggestionKind.INVOCATION,
             isDeprecated ? DART_RELEVANCE_LOW : defaultRelevance, completion,
@@ -686,7 +681,7 @@ class _LocalVisitor extends LocalDeclarationVisitor {
             }
           }
         }
-        request.suggestions.add(suggestion);
+        request.addSuggestion(suggestion);
         return suggestion;
       }
     }