Fix gcc 4.7 building problems - cont 2.

webkit/plugins/npapi/test/plugin_execute_stream_javascript.cc

Index: webkit/plugins/npapi/test/plugin_execute_stream_javascript.cc
diff --git a/webkit/plugins/npapi/test/plugin_execute_stream_javascript.cc b/webkit/plugins/npapi/test/plugin_execute_stream_javascript.cc
index 860c6b3ef482b079c1940b13c4da61427b70e059..8bf2616ad482710ab2ed106514979ca57ef3ef3a 100644
--- a/webkit/plugins/npapi/test/plugin_execute_stream_javascript.cc
+++ b/webkit/plugins/npapi/test/plugin_execute_stream_javascript.cc
@@ -38,8 +38,14 @@ int32 ExecuteStreamJavaScript::Write(NPStream *stream, int32 offset, int32 len,
 
   std::string javascript("javascript:");
   javascript.append(static_cast<char*>(buffer), len);
+  size_t js_length = javascript.length();
+  if (js_length != static_cast<uint32_t>(js_length)) {
+    SetError("Javascript too long.");
+    return -1;
+  }
 
-  NPString script_string = { javascript.c_str(), javascript.length() };
+  NPString script_string = { javascript.c_str(),
+                             static_cast<uint32_t>(js_length) };
   NPObject *window_obj = NULL;
   NPAPIClient::PluginClient::HostFunctions()->getvalue(
       id(), NPNVWindowNPObject, &window_obj);