Fix the uses of T* conversion operator from scoped_refptr<T> which is now removed.

chromecast/common/chromecast_config.cc

Index: chromecast/common/chromecast_config.cc
diff --git a/chromecast/common/chromecast_config.cc b/chromecast/common/chromecast_config.cc
index 0e4261d55dbc489321533d05b2f7b2c9d2ca5056..e2ca9502e0c04e0a83e2c000638b1f23ada0d3a0 100644
--- a/chromecast/common/chromecast_config.cc
+++ b/chromecast/common/chromecast_config.cc
@@ -81,8 +81,9 @@ bool ChromecastConfig::Load(PrefRegistrySimple* registry) {
   PersistentPrefStore::PrefReadError prefs_read_error =
       PersistentPrefStore::PREF_READ_ERROR_NONE;
   base::PrefServiceFactory prefServiceFactory;
-  prefServiceFactory.SetUserPrefsFile(config_path_,
-      JsonPrefStore::GetTaskRunnerForFile(config_path_, worker_pool_));
+  scoped_refptr<base::SequencedTaskRunner> task_runner =
+      JsonPrefStore::GetTaskRunnerForFile(config_path_, worker_pool_.get());
+  prefServiceFactory.SetUserPrefsFile(config_path_, task_runner.get());
   prefServiceFactory.set_async(false);
   prefServiceFactory.set_read_error_callback(
       base::Bind(&UserPrefsLoadError, &prefs_read_error));