Fix DaemonControllerLinux::SetConfigAndStart() to reload config automatically.

remoting/host/plugin/daemon_controller_mac.cc

Index: remoting/host/plugin/daemon_controller_mac.cc
diff --git a/remoting/host/plugin/daemon_controller_mac.cc b/remoting/host/plugin/daemon_controller_mac.cc
index 66505c833e9b0196f9deacb4784ee64626929c92..211cd6402f7d6cd4c65098d290aaee07e924bff8 100644
--- a/remoting/host/plugin/daemon_controller_mac.cc
+++ b/remoting/host/plugin/daemon_controller_mac.cc
@@ -228,15 +228,10 @@ void DaemonControllerMac::DoUpdateConfig(
     done_callback.Run(RESULT_FAILED);
     return;
   }
-  for (DictionaryValue::key_iterator key(config->begin_keys());
-       key != config->end_keys(); ++key) {
-    std::string value;
-    if (!config->GetString(*key, &value)) {
-      LOG(ERROR) << *key << " is not a string.";
-      done_callback.Run(RESULT_FAILED);
-      return;
-    }
-    config_file.SetString(*key, value);
+  if (!config_file.CopyFrom(config.Get())) {
+    LOG(ERROR) << "Failed to update configuration.";
+    done_callback.Run(RESULT_FAILED);
+    return;
   }
 
   std::string config_data = config_file.GetSerializedData();