Fix a crash when loading about:net-internals#spdy and the next_protos() is NULL

chrome/browser/ui/webui/net_internals_ui.cc

Index: chrome/browser/ui/webui/net_internals_ui.cc
===================================================================
--- chrome/browser/ui/webui/net_internals_ui.cc	(revision 102354)
+++ chrome/browser/ui/webui/net_internals_ui.cc	(working copy)
@@ -1191,10 +1191,14 @@
   status_dict->Set("force_spdy_always",
                    Value::CreateBooleanValue(
                        net::HttpStreamFactory::force_spdy_always()));
-  status_dict->Set("next_protos",
-                   Value::CreateStringValue(
-                       *net::HttpStreamFactory::next_protos()));
 
+  // The next_protos may not be specified for certain configurations of SPDY.
+  Value* next_protos_value = net::HttpStreamFactory::next_protos() ?
+      Value::CreateStringValue(*net::HttpStreamFactory::next_protos()) :
+      Value::CreateStringValue("");
+
+  status_dict->Set("next_protos", next_protos_value);
+
   SendJavascriptCommand(L"receivedSpdyStatus", status_dict);
 }