libchrome: Several upstreamable fixes from libchrome

dbus/exported_object.cc

Index: dbus/exported_object.cc
diff --git a/dbus/exported_object.cc b/dbus/exported_object.cc
index 19d17150ea4189cb911f681ffa0c3abd8c170864..2041a66120924e3de8bb97318a3d70202fb46419 100644
--- a/dbus/exported_object.cc
+++ b/dbus/exported_object.cc
@@ -187,7 +187,7 @@ bool ExportedObject::Register() {
 }
 
 DBusHandlerResult ExportedObject::HandleMessage(
-    DBusConnection* connection,
+    DBusConnection* /* connection */,
     DBusMessage* raw_message) {
   bus_->AssertOnDBusThread();
   DCHECK_EQ(DBUS_MESSAGE_TYPE_METHOD_CALL, dbus_message_get_type(raw_message));
@@ -301,8 +301,7 @@ void ExportedObject::OnMethodCompleted(std::unique_ptr<MethodCall> method_call,
                       base::TimeTicks::Now() - start_time);
 }
 
-void ExportedObject::OnUnregistered(DBusConnection* connection) {
-}
+void ExportedObject::OnUnregistered(DBusConnection* /* connection */) {}
 
 DBusHandlerResult ExportedObject::HandleMessageThunk(
     DBusConnection* connection,