Fix gcc 4.7 building problems - cont 2.

webkit/plugins/npapi/test/plugin_windowless_test.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #define STRSAFE_NO_DEPRECATE
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "webkit/plugins/npapi/test/plugin_windowless_test.h"
 #include "webkit/plugins/npapi/test/plugin_client.h"
 
@@ skipping 116 matching lines @@
   }
   // If this test failed, then we'd have crashed by now.
   return PluginTest::HandleEvent(event);
 }
 
 NPError WindowlessPluginTest::ExecuteScript(NPNetscapeFuncs* browser, NPP id,
     const std::string& script, NPVariant* result) {
   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);
 
   NPVariant unused_result;
   if (!result)
     result = &unused_result;
 
   return browser->evaluate(id, window_obj, &script_string, result);
 }
 
@@ skipping 117 matching lines @@
     error_string.append(StringForPoint(flipped_window_x, flipped_window_y));
     SetError(error_string);
   }
 #else
   SetError("Unimplemented");
 #endif
   SignalTestCompleted();
 }
 
 } // namespace NPAPIClient