remove unused cache arguments

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

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library services.completion.dart;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/completion/arglist_computer.dart';
@@ skipping 49 matching lines @@
           new LocalComputer(),
           new ArgListComputer(),
           new CombinatorComputer(),
           new ImportedComputer(),
           new InvocationComputer()];
 
   /**
    * Create a new initialized Dart source completion manager
    */
   factory DartCompletionManager.create(AnalysisContext context,
-      SearchEngine searchEngine, Source source, CompletionCache oldCache) {
-    DartCompletionCache newCache;
-    if (oldCache is DartCompletionCache) {
-      if (oldCache.context == context && oldCache.source == source) {
-        newCache = oldCache;
-      }
-    }
-    if (newCache == null) {
-      newCache = new DartCompletionCache(context, source);
-    }
-    return new DartCompletionManager(context, searchEngine, source, newCache);
+      SearchEngine searchEngine, Source source) {
+    return new DartCompletionManager(
+        context,
+        searchEngine,
+        source,
+        new DartCompletionCache(context, source));
   }
 
   @override
   void computeSuggestions(CompletionRequest completionRequest) {
     DartCompletionRequest request = new DartCompletionRequest(
         context,
         searchEngine,
         source,
         completionRequest.offset,
         cache,
@@ skipping 168 matching lines @@
   _ReplacementOffsetBuilder(this.request) {
     request.replacementOffset = request.offset;
     request.replacementLength = 0;
   }
 
   visitSimpleIdentifier(SimpleIdentifier node) {
     request.replacementOffset = node.offset;
     request.replacementLength = node.length;
   }
 }