PPAPI: Make V8VarConverter longer-lived

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 7260b01bb0bf75d6ef81f9e24f76026a05d7de2e..849e44a02fd4bc99c0491aab2835994cac2b6252 100644
--- a/content/renderer/pepper/plugin_object.cc
+++ b/content/renderer/pepper/plugin_object.cc
@@ -71,7 +71,9 @@ PluginObject* PluginObject::FromV8Object(v8::Isolate* isolate,
 PP_Var PluginObject::Create(PepperPluginInstanceImpl* instance,
                             const PPP_Class_Deprecated* ppp_class,
                             void* ppp_class_data) {
-  PepperTryCatchVar try_catch(instance, NULL);
+  V8VarConverter var_converter(instance->pp_instance(),
+                               V8VarConverter::kAllowObjectVars);
+  PepperTryCatchVar try_catch(instance, &var_converter, NULL);
   gin::Handle<PluginObject> object =
       gin::CreateHandle(instance->GetIsolate(),
                         new PluginObject(instance, ppp_class, ppp_class_data));
@@ -94,8 +96,9 @@ std::vector<std::string> PluginObject::EnumerateNamedProperties(
   if (!instance_)
     return result;
 
-  PepperTryCatchV8 try_catch(instance_, V8VarConverter::kAllowObjectVars,
-                             isolate);
+  V8VarConverter var_converter(instance_->pp_instance(),
+                               V8VarConverter::kAllowObjectVars);
+  PepperTryCatchV8 try_catch(instance_, &var_converter, isolate);
 
   PP_Var* name_vars;
   uint32_t count = 0;
@@ -147,8 +150,9 @@ v8::Local<v8::Value> PluginObject::GetPropertyOrMethod(v8::Isolate* isolate,
   if (!instance_)
     return v8::Local<v8::Value>();
 
-  PepperTryCatchV8 try_catch(instance_, V8VarConverter::kAllowObjectVars,
-                             isolate);
+  V8VarConverter var_converter(instance_->pp_instance(),
+                               V8VarConverter::kAllowObjectVars);
+  PepperTryCatchV8 try_catch(instance_, &var_converter, isolate);
   bool has_property =
       ppp_class_->HasProperty(ppp_class_data_, identifier_var,
                               try_catch.exception());
@@ -192,8 +196,9 @@ void PluginObject::Call(const std::string& identifier,
   if (!instance_)
     return;
 
-  PepperTryCatchV8 try_catch(instance_, V8VarConverter::kAllowObjectVars,
-                             args->isolate());
+  V8VarConverter var_converter(instance_->pp_instance(),
+                               V8VarConverter::kAllowObjectVars);
+  PepperTryCatchV8 try_catch(instance_, &var_converter, args->isolate());
   ScopedPPVar identifier_var(ScopedPPVar::PassRef(),
                              StringVar::StringToPPVar(identifier));
   ScopedPPVarArray argument_vars(args->Length());