Make V8ValueConverter.FromV8Value behave similarly to JSON.stringify

chrome/renderer/extensions/event_bindings.cc

Index: chrome/renderer/extensions/event_bindings.cc
diff --git a/chrome/renderer/extensions/event_bindings.cc b/chrome/renderer/extensions/event_bindings.cc
index 329a70bb8cda4fc3769dda4bcd645841125c3f9e..94258dbeca6d2cab08180df321a0cafa79bd0cdd 100644
--- a/chrome/renderer/extensions/event_bindings.cc
+++ b/chrome/renderer/extensions/event_bindings.cc
@@ -191,6 +191,8 @@ class ExtensionImpl : public ChromeV8Extension {
     base::DictionaryValue* filter_dict = NULL;
     base::Value* filter_value = converter->FromV8Value(args[1]->ToObject(),
         v8::Context::GetCurrent());
+    if (!filter_value)
+      return v8::Integer::New(-1);
     if (!filter_value->GetAsDictionary(&filter_dict)) {
       delete filter_value;
       return v8::Integer::New(-1);