Introduce MockResourceConverter to modularize testing of V8VarConverter

content/renderer/pepper/message_channel.cc

Index: content/renderer/pepper/message_channel.cc
diff --git a/content/renderer/pepper/message_channel.cc b/content/renderer/pepper/message_channel.cc
index 39e44289c6ce49b792713b4814785c0c684dee2a..a4688805bea120c15f74f6c8d451edfa865f1eae 100644
--- a/content/renderer/pepper/message_channel.cc
+++ b/content/renderer/pepper/message_channel.cc
@@ -354,7 +354,7 @@ void MessageChannel::NPVariantToPPVar(const NPVariant* variant) {
       // Calling WebBindings::toV8Value creates a wrapper around NPVariant so it
       // shouldn't result in a deep copy.
       v8::Handle<v8::Value> v8_value = WebBindings::toV8Value(variant);
-      V8VarConverter::FromV8Value(v8_value, v8::Context::GetCurrent(),
+      V8VarConverter().FromV8Value(v8_value, v8::Context::GetCurrent(),
           base::Bind(&MessageChannel::NPVariantToPPVarComplete,
               weak_ptr_factory_.GetWeakPtr(), result_iterator));
       return;
@@ -383,7 +383,7 @@ void MessageChannel::PostMessageToJavaScript(PP_Var message_data) {
   v8::Context::Scope context_scope(context);
 
   v8::Handle<v8::Value> v8_val;
-  if (!V8VarConverter::ToV8Value(message_data, context, &v8_val)) {
+  if (!V8VarConverter().ToV8Value(message_data, context, &v8_val)) {
     PpapiGlobals::Get()->LogWithSource(instance_->pp_instance(),
         PP_LOGLEVEL_ERROR, std::string(), kVarToV8ConversionError);
     return;