Fix two analyzer warnings.

pkg/analysis_server/lib/src/services/completion/statement/statement_completion.dart

 // Copyright (c) 2017, 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.src.completion.statement;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/protocol_server.dart' hide Element;
@@ skipping 220 matching lines @@
   }
 
   String _baseNodeText(AstNode astNode) {
     String text = utils.getNodeText(astNode);
     if (text.endsWith(eol)) {
       text = text.substring(0, text.length - eol.length);
     }
     return text;
   }
 
-  bool _complete_controlFlowBlock() {

[messick, 2017/04/20 17:30:49]

You could fix the warning by calling this method from compute(). Or, you could
wait for my next commit which will do that.

[devoncarew, 2017/04/20 17:37:36]

If this warning will be addressed shortly then I will revert this part of the
CL.

-    //TODO(messick) Implement _complete_controlFlowBlock
-    // Use statement completion to move the cursor to a new line outside the
-    // current block. The statement has no errors in this case. Used to jump
-    // out of do/for/if/while blocks.
-    //TODO(messick) Move has-errors checking into dispatch method.
-    return false;
-  }
+//  bool _complete_controlFlowBlock() {
+//    //TODO(messick) Implement _complete_controlFlowBlock
+//    // Use statement completion to move the cursor to a new line outside the
+//    // current block. The statement has no errors in this case. Used to jump
+//    // out of do/for/if/while blocks.
+//    //TODO(messick) Move has-errors checking into dispatch method.
+//    return false;
+//  }
 
   bool _complete_doStatement() {
     if (errors.isEmpty || node is! DoStatement) {
       return false;
     }
     DoStatement statement = node;
     SourceBuilder sb = _sourceBuilderAfterKeyword(statement.doKeyword);
     bool hasWhileKeyword = statement.whileKeyword.lexeme == "while";
     int exitDelta = 0;
     if (statement.body is EmptyStatement) {
@@ skipping 437 matching lines @@
   final Token keyword;
   final Token leftParenthesis, rightParenthesis;
   final Expression condition;
   final Statement block;
 
   _KeywordConditionBlockStructure(this.keyword, this.leftParenthesis,
       this.condition, this.rightParenthesis, this.block);
 
   int get offset => keyword.offset;
 }