Add default case to test method.

net/tools/quic/stateless_rejector_test.cc

Index: net/tools/quic/stateless_rejector_test.cc
diff --git a/net/tools/quic/stateless_rejector_test.cc b/net/tools/quic/stateless_rejector_test.cc
index 1b1f3cb0fa92be34756dc7a41e3ad950ef26c05c..92465357d496376b05a0d5d2e7038576e9baa65c 100644
--- a/net/tools/quic/stateless_rejector_test.cc
+++ b/net/tools/quic/stateless_rejector_test.cc
@@ -39,6 +39,9 @@ const char* FlagsModeToString(FlagsMode mode) {
       return "CHEAP_DISABLED";
     case BOTH_DISABLED:
       return "BOTH_DISABLED";
+    default:
+      NOTREACHED();

[Ryan Hamilton, 2016/09/12 16:42:23]

This code is shared with the internal repository that does not have
NOTREACHED();

Can you replace this with:

DLOG(FATAL) << "Unexpected FlagsMode";

I'll land this change internally.

+      return nullptr;
   }
 }