Redo normal expressions in dialog updater to be thread-safe

plugins/org.chromium.debug.ui/src/org/chromium/debug/ui/WizardUtils.java

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.debug.ui;
 
 import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
@@ skipping 262 matching lines @@
     }
   }
 
   /**
    * A utility class that ties {@link Updater} together with {@link LogicBasedWizard}.
    * It is fed with {@link WizardFinisher} value and optional warning value.
    * It controls messages and 'finish' button of the wizard.
    */
   public static class WizardFinishController implements ValueConsumer {
     private final ValueSource<? extends Optional<? extends WizardFinisher>> finisherValue;
-    private final ValueSource<? extends Optional<Void>> warningValue;
+    private final ValueSource<? extends Optional<?>> warningValue;
     private final LogicBasedWizard wizardImpl;
 
     public WizardFinishController(
         ValueSource<? extends Optional<? extends WizardFinisher>> finisherValue,
-        ValueSource<? extends Optional<Void>> warningValue,
+        ValueSource<? extends Optional<? extends Void>> warningValue,
         LogicBasedWizard wizardImpl) {
       this.finisherValue = finisherValue;
       this.warningValue = warningValue;
       this.wizardImpl = wizardImpl;
     }
 
     public void update(Updater updater) {
       WizardFinisher finisher;
       Set<Message> messages = new HashSet<Message>();
       if (warningValue != null) {
-        Optional<Void> warnings = warningValue.getValue();
+        Optional<?> warnings = warningValue.getValue();
         if (!warnings.isNormal()) {
           messages.addAll(warnings.errorMessages());
         }
       }
       if (finisherValue.getValue().isNormal()) {
         finisher = finisherValue.getValue().getNormal();
       } else {
         finisher = null;
         messages.addAll(finisherValue.getValue().errorMessages());
       }
@@ skipping 17 matching lines @@
 
     public void setEnabled(boolean enabled, boolean recursive) {
       if (enabled) {
         basePage.linkToNextPage(nextPage);
       } else {
         basePage.unlinkFromNextPage(nextPage);
       }
     }
   }
 }