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 5cf22a0e360fabbb572415fcd8b50b5209a68dde..8cf4429fa945ba5788c363ddc9d6f973bccebb5f 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>());