libchrome: Several upstreamable fixes from libchrome

dbus/object_manager.cc

Index: dbus/object_manager.cc
diff --git a/dbus/object_manager.cc b/dbus/object_manager.cc
index 56143c758b4bb9b40f72e0f55075e0caa1f77ddc..178bb5ff12ea6a2d1d8a8d828ebe9a570d0ca3ce 100644
--- a/dbus/object_manager.cc
+++ b/dbus/object_manager.cc
@@ -249,7 +249,7 @@ DBusHandlerResult ObjectManager::HandleMessageThunk(DBusConnection* connection,
   return self->HandleMessage(connection, raw_message);
 }
 
-DBusHandlerResult ObjectManager::HandleMessage(DBusConnection* connection,
+DBusHandlerResult ObjectManager::HandleMessage(DBusConnection*,
                                                DBusMessage* raw_message) {
   DCHECK(bus_);
   bus_->AssertOnDBusThread();
@@ -385,9 +385,10 @@ void ObjectManager::InterfacesAddedReceived(Signal* signal) {
   UpdateObject(object_path, &reader);
 }
 
-void ObjectManager::InterfacesAddedConnected(const std::string& interface_name,
-                                             const std::string& signal_name,
-                                             bool success) {
+void ObjectManager::InterfacesAddedConnected(
+    const std::string& /*interface_name*/,
+    const std::string& /*signal_name*/,
+    bool success) {
   LOG_IF(WARNING, !success) << service_name_ << " " << object_path_.value()
                             << ": Failed to connect to InterfacesAdded signal.";
 }
@@ -410,8 +411,8 @@ void ObjectManager::InterfacesRemovedReceived(Signal* signal) {
 }
 
 void ObjectManager::InterfacesRemovedConnected(
-    const std::string& interface_name,
-    const std::string& signal_name,
+    const std::string& /*interface_name*/,
+    const std::string& /*signal_name*/,
     bool success) {
   LOG_IF(WARNING, !success) << service_name_ << " " << object_path_.value()
                             << ": Failed to connect to "