Fix auto raw pointer deduction on linux

components/ntp_snippets/remote/remote_suggestion_unittest.cc

Index: components/ntp_snippets/remote/remote_suggestion_unittest.cc
diff --git a/components/ntp_snippets/remote/remote_suggestion_unittest.cc b/components/ntp_snippets/remote/remote_suggestion_unittest.cc
index 7034ebf58b8ac3112ff1009a4cbd595fcd952cfb..f80a29948f56a5bb1eb3f354a0e1ed580042d855 100644
--- a/components/ntp_snippets/remote/remote_suggestion_unittest.cc
+++ b/components/ntp_snippets/remote/remote_suggestion_unittest.cc
@@ -394,7 +394,7 @@ TEST(RemoteSuggestionTest, CreateFromProtoToProtoRoundtrip) {
   proto.set_score(0.1f);
   proto.set_dismissed(false);
   proto.set_remote_category_id(1);
-  auto source = proto.add_sources();
+  auto* source = proto.add_sources();
   source->set_url("http://cool-suggestions.com/");
   source->set_publisher_name("Great Suggestions Inc.");
   source->set_amp_url("http://cdn.ampproject.org/c/foo/");