Fix ExtensionServiceTest.ClearExtensionData flakiness

chrome/browser/extensions/external_install_error.cc

 // Copyright 2014 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/external_install_error.h"
 
 #include "base/bind.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 269 matching lines @@
     manager_->RemoveExternalInstallError();
   }
 }
 
 void ExternalInstallError::InstallUIAbort(bool user_initiated) {
   if (user_initiated && GetExtension()) {
     ExtensionSystem::Get(browser_context_)
         ->extension_service()
         ->UninstallExtension(extension_id_,
                              extensions::UNINSTALL_REASON_INSTALL_CANCELED,
+                             base::Bind(&base::DoNothing),
                              NULL);  // Ignore error.
     // Since the manager listens for the extension to be removed, this will
     // remove the error...
   } else {
     // ... Otherwise we have to do it explicitly.
     manager_->RemoveExternalInstallError();
   }
 }
 
 void ExternalInstallError::ShowDialog(Browser* browser) {
@@ skipping 83 matching lines @@
     if (browser)
       global_error_->ShowBubbleView(browser);
   } else {
     DCHECK(alert_type_ == MENU_ALERT);
     global_error_.reset(new ExternalInstallMenuAlert(this));
     error_service_->AddGlobalError(global_error_.get());
   }
 }
 
 }  // namespace extensions