Fix gcc 4.7 building problems - cont 2.

webkit/plugins/npapi/test/plugin_windowless_test.cc

Index: webkit/plugins/npapi/test/plugin_windowless_test.cc
diff --git a/webkit/plugins/npapi/test/plugin_windowless_test.cc b/webkit/plugins/npapi/test/plugin_windowless_test.cc
index d92a43173710e191f0b5284c9bc81ebd2d3e2237..9013651bf32416e9af982944ed1c99eb72a26cc2 100644
--- a/webkit/plugins/npapi/test/plugin_windowless_test.cc
+++ b/webkit/plugins/npapi/test/plugin_windowless_test.cc
@@ -134,7 +134,13 @@ NPError WindowlessPluginTest::ExecuteScript(NPNetscapeFuncs* browser, NPP id,
   std::string script_url = "javascript:";
   script_url += script;
 
-  NPString script_string = { script_url.c_str(), script_url.length() };
+  size_t script_length = script_url.length();
+  if (script_length != static_cast<uint32_t>(script_length)) {
+    return NPERR_GENERIC_ERROR;
+  }
+
+  NPString script_string = { script_url.c_str(),
+                             static_cast<uint32_t>(script_length) };
   NPObject *window_obj = NULL;
   browser->getvalue(id, NPNVWindowNPObject, &window_obj);