Migrate a bunch of LayoutTests from NPAPI to PPAPI

content/renderer/pepper/plugin_object.cc

Index: content/renderer/pepper/plugin_object.cc
diff --git a/content/renderer/pepper/plugin_object.cc b/content/renderer/pepper/plugin_object.cc
index 3fb63795de43b5dc1f275b4913cf0ede464b154c..cb5ff6af9bbd924ae918b87e196c2b130afb5cc6 100644
--- a/content/renderer/pepper/plugin_object.cc
+++ b/content/renderer/pepper/plugin_object.cc
@@ -146,8 +146,12 @@ bool PluginObject::SetNamedProperty(v8::Isolate* isolate,
 std::vector<std::string> PluginObject::EnumerateNamedProperties(
     v8::Isolate* isolate) {
   std::vector<std::string> result;
-  if (!instance_)
+  if (!instance_) {
+    std::string error = "Plugin object deleted";
+    isolate->ThrowException(
+        v8::Exception::ReferenceError(gin::StringToV8(isolate, error)));
     return result;
+  }
 
   V8VarConverter var_converter(instance_->pp_instance(),
                                V8VarConverter::kAllowObjectVars);