Fix ExtensionServiceTest.ClearExtensionData flakiness

chrome/browser/themes/theme_service_unittest.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/file_util.h"
 #include "base/path_service.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 102 matching lines @@
   // Let the ThemeService uninstall unused themes.
   base::MessageLoop::current()->RunUntilIdle();
 
   base::ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
   const std::string& extension_id = LoadUnpackedThemeAt(temp_dir.path());
   EXPECT_FALSE(theme_service->UsingDefaultTheme());
   EXPECT_EQ(extension_id, theme_service->GetThemeID());
 
   // Now uninstall the extension, should revert to the default theme.
-  service_->UninstallExtension(
-      extension_id, extensions::UNINSTALL_REASON_FOR_TESTING, NULL);
+  service_->UninstallExtension(extension_id,
+                               extensions::UNINSTALL_REASON_FOR_TESTING,
+                               base::Bind(&base::DoNothing),
+                               NULL);
   EXPECT_TRUE(theme_service->UsingDefaultTheme());
 }
 
 // Test that a theme extension is disabled when not in use. A theme may be
 // installed but not in use if it there is an infobar to revert to the previous
 // theme.
 TEST_F(ThemeServiceTest, DisableUnusedTheme) {
   ThemeService* theme_service =
       ThemeServiceFactory::GetForProfile(profile_.get());
   theme_service->UseDefaultTheme();
@@ skipping 129 matching lines @@
       ThemeServiceFactory::GetForProfile(profile_.get());
   theme_service->UseDefaultTheme();
   EXPECT_TRUE(theme_service->UsingDefaultTheme());
   EXPECT_TRUE(get_theme_supplier(theme_service));
   EXPECT_EQ(get_theme_supplier(theme_service)->get_theme_type(),
             CustomThemeSupplier::SUPERVISED_USER_THEME);
 }
 #endif
 
 }; // namespace theme_service_internal