[Sync] Require ProfileSyncService to have an uninitialized backend on shutdown

chrome/browser/sync/profile_sync_service_password_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 <vector>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 139 matching lines @@
   virtual void SetUp() {
     AbstractProfileSyncServiceTest::SetUp();
     profile_.CreateRequestContext();
     password_store_ = static_cast<MockPasswordStore*>(
         PasswordStoreFactory::GetInstance()->SetTestingFactoryAndUse(
             &profile_, MockPasswordStore::Build).get());
   }
 
   virtual void TearDown() {
     password_store_->ShutdownOnUIThread();
+    service_->Shutdown();
     service_.reset();
     profile_.ResetRequestContext();
     AbstractProfileSyncServiceTest::TearDown();
   }
 
   static void SignalEvent(base::WaitableEvent* done) {
     done->Signal();
   }
 
   void FlushLastDBTask() {
@@ skipping 393 matching lines @@
   CreateRootHelper create_root(this, syncer::PASSWORDS);
   StartSyncService(create_root.callback(),
                    base::Bind(&AddPasswordEntriesCallback, this, sync_forms));
 
   std::vector<PasswordForm> new_sync_forms;
   GetPasswordEntriesFromSyncDB(&new_sync_forms);
 
   EXPECT_EQ(1U, new_sync_forms.size());
   EXPECT_TRUE(ComparePasswords(expected_forms[0], new_sync_forms[0]));
 }