Renames to move closer to the new API

pkg/analysis_server/lib/completion/completion_core.dart

 // Copyright (c) 2015, 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 analysis_server.completion.completion_core;
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
@@ skipping 27 matching lines @@
    * this location.
    */
   //CompletionResult get previousResults;
 
   /**
    * Return the analysis context in which the completion is being requested.
    */
   AnalysisContext get context;
 
   /**
-   * The offset within the source at which the completion is being requested.
+   * Return the offset within the source at which the completion is being
+   * requested.
    */
   int get offset;
 
   /**
    * Return the resource provider associated with this request.
    */
   ResourceProvider get resourceProvider;
 
   /**
    * Return the source in which the completion is being requested.
@@ skipping 38 matching lines @@
    * the replacementOffset will be the offset of the beginning of the
    * identifier.
    */
   int get replacementOffset;
 
   /**
    * Return the list of suggestions being contributed by the contributor.
    */
   List<CompletionSuggestion> get suggestions;
 }