Fix ExtensionServiceTest.ClearExtensionData flakiness

chrome/browser/search/hotword_service.cc

 // Copyright 2013 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/search/hotword_service.h"
 
 #include "base/i18n/case_conversion.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
@@ skipping 347 matching lines @@
 
   return UninstallHotwordExtension(extension_service);
 }
 
 bool HotwordService::UninstallHotwordExtension(
     ExtensionService* extension_service) {
   base::string16 error;
   if (!extension_service->UninstallExtension(
           extension_misc::kHotwordExtensionId,
           extensions::UNINSTALL_REASON_INTERNAL_MANAGEMENT,
+          base::Bind(&base::DoNothing),
           &error)) {
     LOG(WARNING) << "Cannot uninstall extension with id "
                  << extension_misc::kHotwordExtensionId
                  << ": " << error;
     reinstall_pending_ = false;
     return false;
   }
   return true;
 }
 
@@ skipping 124 matching lines @@
     return false;
 
   std::string previous_locale =
       profile_->GetPrefs()->GetString(prefs::kHotwordPreviousLanguage);
   std::string locale = GetCurrentLocale(profile_);
 
   // If it's a new locale, then the old extension should be uninstalled.
   return locale != previous_locale &&
       HotwordService::DoesHotwordSupportLanguage(profile_);
 }