Fix ExtensionServiceTest.ClearExtensionData flakiness

chrome/browser/themes/theme_service.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/themes/theme_service.h"
 
 #include "base/bind.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_service.h"
@@ skipping 354 matching lines @@
           disable_reason == Extension::DISABLE_USER_ACTION) {
         remove_list.push_back((*it)->id());
       }
     }
   }
   // TODO: Garbage collect all unused themes. This method misses themes which
   // are installed but not loaded because they are blacklisted by a management
   // policy provider.
 
   for (size_t i = 0; i < remove_list.size(); ++i) {
-    service->UninstallExtension(
-        remove_list[i], extensions::UNINSTALL_REASON_ORPHANED_THEME, NULL);
+    service->UninstallExtension(remove_list[i],
+                                extensions::UNINSTALL_REASON_ORPHANED_THEME,
+                                base::Bind(&base::DoNothing),
+                                NULL);
   }
 }
 
 void ThemeService::UseDefaultTheme() {
   if (ready_)
     content::RecordAction(UserMetricsAction("Themes_Reset"));
   if (IsSupervisedUser()) {
     SetSupervisedUserTheme();
     return;
   }
@@ skipping 216 matching lines @@
 void ThemeService::OnInfobarDestroyed() {
   number_of_infobars_--;
 
   if (number_of_infobars_ == 0)
     RemoveUnusedThemes(false);
 }
 
 ThemeSyncableService* ThemeService::GetThemeSyncableService() const {
   return theme_syncable_service_.get();
 }