remove unused analysis server flag

pkg/analysis_server/lib/src/analysis_server.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.
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:core';
 import 'dart:io' as io;
 import 'dart:math' show max;
 
@@ skipping 1046 matching lines @@
       scheduleImplementedNotification(this, files);
     }
   }
 }
 
 /**
  * Various IDE options.
  */
 class AnalysisServerOptions {
   bool useAnalysisHighlight2 = false;
-  bool enableVerboseFlutterCompletions = false;
 
   String fileReadMode = 'as-is';
   String newAnalysisDriverLog;
 
   String clientId;
   String clientVersion;
 
   /**
    * The analytics instance; note, this object can be `null`, and should be
    * accessed via a null-aware operator.
@@ skipping 417 matching lines @@
   /**
    * The [PerformanceTag] for time spent in server request handlers.
    */
   static PerformanceTag serverRequests = server.createChild('requests');
 
   /**
    * The [PerformanceTag] for time spent in split store microtasks.
    */
   static PerformanceTag splitStore = new PerformanceTag('splitStore');
 }