extensions: Change auto to not deduce raw pointers.

extensions/browser/api/serial/serial_apitest.cc

Index: extensions/browser/api/serial/serial_apitest.cc
diff --git a/extensions/browser/api/serial/serial_apitest.cc b/extensions/browser/api/serial/serial_apitest.cc
index 14fbabbd832071a7374667f181fcb56950a6c2e6..d0e9b58830cf25f172e54f5083fb7d2b67849250 100644
--- a/extensions/browser/api/serial/serial_apitest.cc
+++ b/extensions/browser/api/serial/serial_apitest.cc
@@ -135,10 +135,9 @@ ExtensionFunction* FakeSerialConnectFunctionFactory() {
 void CreateTestSerialServiceOnFileThread(
     mojo::InterfaceRequest<device::serial::SerialService> request) {
   auto io_handler_factory = base::Bind(&FakeEchoSerialIoHandler::Create);
-  auto connection_factory = new device::SerialConnectionFactory(
-      io_handler_factory,
-      content::BrowserThread::GetMessageLoopProxyForThread(
-          content::BrowserThread::IO));
+  auto* connection_factory = new device::SerialConnectionFactory(
+      io_handler_factory, content::BrowserThread::GetMessageLoopProxyForThread(
+                              content::BrowserThread::IO));
   std::unique_ptr<device::SerialDeviceEnumerator> device_enumerator(
       new FakeSerialDeviceEnumerator);
   new device::SerialServiceImpl(