Fix ExtensionServiceTest.ClearExtensionData flakiness

chrome/browser/ui/browser_browsertest.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 <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
@@ skipping 1290 matching lines @@
                         TabStripModel::ADD_NONE);
   model->SetTabPinned(0, true);
   ui_test_utils::NavigateToURL(browser(), url);
 
   MockTabStripModelObserver observer;
   model->AddObserver(&observer);
 
   // Uninstall the extension and make sure TabClosing is sent.
   ExtensionService* service = extensions::ExtensionSystem::Get(
       browser()->profile())->extension_service();
-  service->UninstallExtension(
-      GetExtension()->id(), extensions::UNINSTALL_REASON_FOR_TESTING, NULL);
+  service->UninstallExtension(GetExtension()->id(),
+                              extensions::UNINSTALL_REASON_FOR_TESTING,
+                              base::Bind(&base::DoNothing),
+                              NULL);
   EXPECT_EQ(1, observer.closing_count());
 
   model->RemoveObserver(&observer);
 
   // There should only be one tab now.
   ASSERT_EQ(1, browser()->tab_strip_model()->count());
 }
 
 #if !defined(OS_MACOSX)
 // Open with --app-id=<id>, and see that an app window opens.
@@ skipping 1397 matching lines @@
 #endif
   EXPECT_EQ(exp_commit_size, rwhv_commit_size2);
   EXPECT_EQ(exp_commit_size, wcv_commit_size2);
   gfx::Size exp_final_size(initial_wcv_size);
   exp_final_size.Enlarge(wcv_resize_insets.width(),
                          wcv_resize_insets.height() + height_inset);
   EXPECT_EQ(exp_final_size,
             web_contents->GetRenderWidgetHostView()->GetViewBounds().size());
   EXPECT_EQ(exp_final_size, web_contents->GetContainerBounds().size());
 }