Fix ExtensionServiceTest.ClearExtensionData flakiness

chrome/browser/extensions/extension_context_menu_model.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/extensions/extension_context_menu_model.h"
 
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/api/extension_action/extension_action_api.h"
 #include "chrome/browser/extensions/extension_action.h"
@@ skipping 130 matching lines @@
     default:
      NOTREACHED() << "Unknown option";
      break;
   }
 }
 
 void ExtensionContextMenuModel::ExtensionUninstallAccepted() {
   if (GetExtension()) {
     extensions::ExtensionSystem::Get(profile_)
         ->extension_service()
-        ->UninstallExtension(
-            extension_id_, extensions::UNINSTALL_REASON_USER_INITIATED, NULL);
+        ->UninstallExtension(extension_id_,
+                             extensions::UNINSTALL_REASON_USER_INITIATED,
+                             base::Bind(&base::DoNothing),
+                             NULL);
   }
   Release();
 }
 
 void ExtensionContextMenuModel::ExtensionUninstallCanceled() {
   Release();
 }
 
 ExtensionContextMenuModel::~ExtensionContextMenuModel() {}
 
@@ skipping 18 matching lines @@
     AddItemWithStringId(HIDE, IDS_EXTENSIONS_HIDE_BUTTON);
   AddSeparator(ui::NORMAL_SEPARATOR);
   AddItemWithStringId(MANAGE, IDS_MANAGE_EXTENSION);
 }
 
 const Extension* ExtensionContextMenuModel::GetExtension() const {
   ExtensionService* extension_service =
       extensions::ExtensionSystem::Get(profile_)->extension_service();
   return extension_service->GetExtensionById(extension_id_, false);
 }