PPAPI: Check for NULL before calling WebBindings::evaluate

content/renderer/pepper/pepper_plugin_instance_impl.cc

Index: content/renderer/pepper/pepper_plugin_instance_impl.cc
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.cc b/content/renderer/pepper/pepper_plugin_instance_impl.cc
index a1116811924e0ad9789ef791752b8a1de7341d0c..15fa1fe0d23f3fa43b76336a3181e0f7ff931dcd 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.cc
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.cc
@@ -2384,9 +2384,11 @@ PP_Var PepperPluginInstanceImpl::ExecuteScript(PP_Instance instance,
   np_script.UTF8Length = script_string->value().length();
 
   // Get the current frame to pass to the evaluate function.
-  WebLocalFrame* frame = container_->element().document().frame();
-  if (!frame) {
-    try_catch.SetException("No frame to execute script in.");
+  WebLocalFrame* frame = NULL;
+  if (container_)
+    frame = container_->element().document().frame();
+  if (!frame || !frame->windowObject()) {
+    try_catch.SetException("No context in which to execute script.");
     return PP_MakeUndefined();
   }