Automated IWYU fix for TaskRunner includes.

chrome/browser/password_manager/simple_password_store_mac.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_PASSWORD_MANAGER_SIMPLE_PASSWORD_STORE_MAC_H_
 #define CHROME_BROWSER_PASSWORD_MANAGER_SIMPLE_PASSWORD_STORE_MAC_H_
 
 #include "base/macros.h"
+#include "base/single_thread_task_runner.h"
 #include "components/password_manager/core/browser/password_store_default.h"
 
 class PrefService;
 
 // The same as PasswordStoreDefault but running on the dedicated thread. The
 // owner is responsible for the thread lifetime.
 class SimplePasswordStoreMac : public password_manager::PasswordStoreDefault {
  public:
   // Passes the arguments to PasswordStoreDefault. |background_task_runner| and
   // |login_db| can be overwritten later in InitWithTaskRunner().
@@ skipping 15 matching lines @@
   ~SimplePasswordStoreMac() override;
 
  private:
   bool Init(const syncer::SyncableService::StartSyncFlare& flare,
             PrefService* prefs) override;
 
   DISALLOW_COPY_AND_ASSIGN(SimplePasswordStoreMac);
 };
 
 #endif  // CHROME_BROWSER_PASSWORD_MANAGER_SIMPLE_PASSWORD_STORE_MAC_H_