Update ppapi/ to use scoped_refptr<T>::get() rather than implicit "operator T*"

ppapi/proxy/serialized_var.h

Index: ppapi/proxy/serialized_var.h
diff --git a/ppapi/proxy/serialized_var.h b/ppapi/proxy/serialized_var.h
index 7c3349f79920529e359c47bce67719b8c8b5e177..98cafa0dac3afe009b54e821ec53dbaa063fa768 100644
--- a/ppapi/proxy/serialized_var.h
+++ b/ppapi/proxy/serialized_var.h
@@ -104,7 +104,7 @@ class PPAPI_PROXY_EXPORT SerializedVar {
     ~Inner();
 
     VarSerializationRules* serialization_rules() {
-      return serialization_rules_;
+      return serialization_rules_.get();
     }
     void set_serialization_rules(VarSerializationRules* serialization_rules) {
       serialization_rules_ = serialization_rules;