Extract protocol_dart.dart APIs.

pkg/analysis_server/lib/src/services/completion/dart_completion_cache.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.cache;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analysis_server/src/protocol_server.dart'
@@ skipping 253 matching lines @@
       suggestion = new CompletionSuggestion(
           CompletionSuggestionKind.INVOCATION,
           DART_RELEVANCE_DEFAULT,
           completion,
           completion.length,
           0,
           importElem.isDeprecated,
           false);
       LibraryElement lib = importElem.importedLibrary;
       if (lib != null) {
-        suggestion.element = newElement_fromEngine(lib);
+        suggestion.element = convertElement(lib);
       }
       libraryPrefixSuggestions.add(suggestion);
       _importedCompletions.add(suggestion.completion);
     }
   }
 
   /**
    * Add suggestions for all top level elements in the context
    * excluding those elemnents for which suggestions have already been added.
    */
@@ skipping 128 matching lines @@
   @override
   void visitFunctionTypeAliasElement(FunctionTypeAliasElement element) {
     cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
   }
 
   @override
   void visitTopLevelVariableElement(TopLevelVariableElement element) {
     cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
   }
 }