Fix ExtensionServiceTest.ClearExtensionData flakiness

chrome/browser/extensions/shared_module_service.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/shared_module_service.h"
 
 #include <set>
 #include <vector>
 
 #include "base/version.h"
@@ skipping 150 matching lines @@
 
   std::vector<std::string>::const_iterator shared_modules_iter;
   for (shared_modules_iter = shared_modules.begin();
        shared_modules_iter != shared_modules.end();
        shared_modules_iter++) {
     if (used_shared_modules.count(*shared_modules_iter))
       continue;
     service->UninstallExtension(
         *shared_modules_iter,
         extensions::UNINSTALL_REASON_ORPHANED_SHARED_MODULE,
+        base::Bind(&base::DoNothing),
         NULL);  // Ignore error.
   }
 }
 
 void SharedModuleService::OnExtensionInstalled(
     content::BrowserContext* browser_context,
     const Extension* extension,
     bool is_update) {
   if (is_update)
     PruneSharedModules();
 }
 
 void SharedModuleService::OnExtensionUninstalled(
     content::BrowserContext* browser_context,
     const Extension* extension,
     extensions::UninstallReason reason) {
   PruneSharedModules();
 }
 
 }  // namespace extensions