Fix auto raw pointer deduction on linux

content/renderer/presentation/presentation_dispatcher_unittest.cc

Index: content/renderer/presentation/presentation_dispatcher_unittest.cc
diff --git a/content/renderer/presentation/presentation_dispatcher_unittest.cc b/content/renderer/presentation/presentation_dispatcher_unittest.cc
index ab2bf4d6dd1592e59ba3f0e8c012da6db26bf8b9..11d8813c6c83762b0198c0356042e822d34ce5d6 100644
--- a/content/renderer/presentation/presentation_dispatcher_unittest.cc
+++ b/content/renderer/presentation/presentation_dispatcher_unittest.cc
@@ -716,7 +716,7 @@ TEST_F(PresentationDispatcherTest,
 
   // Set up |availability_set_| and |listening_status_|
   base::RunLoop run_loop;
-  for (auto& mock_observer : mock_observers_) {
+  for (auto* mock_observer : mock_observers_) {
     client()->getAvailability(
         mock_observer->urls(),
         base::MakeUnique<WebPresentationAvailabilityCallbacks>());