Clean up analyzer hints.

pkg/analysis_server/lib/src/services/correction/namespace.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.src.correction.namespace;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 
@@ skipping 134 matching lines @@
     PrefixedIdentifier prefixed = parent;
     if (prefixed.prefix == prefixNode) {
       usedElement = prefixed.staticElement;
       info.periodEnd = prefixed.period.end;
     }
   }
   if (parent is MethodInvocation) {
     MethodInvocation invocation = parent;
     if (invocation.target == prefixNode) {
       usedElement = invocation.methodName.staticElement;
-      info.periodEnd = invocation.period.end;
+      info.periodEnd = invocation.operator.end;
     }
   }
   // we need used Element
   if (usedElement == null) {
     return null;
   }
   // find ImportElement
   String prefix = prefixNode.name;
   Map<ImportElement, Set<Element>> importElementsMap = {};
   info.element = internal_getImportElement(
       libraryElement, prefix, usedElement, importElementsMap);
   if (info.element == null) {
     return null;
   }
   return info;
 }
 
 /**
  * Information about [ImportElement] and place where it is referenced using
  * [PrefixElement].
  */
 class ImportElementInfo {
   ImportElement element;
   int periodEnd;
 }