Don't send PP_Vars/V8 values with cycles across PostMessage

webkit/plugins/ppapi/v8_var_converter.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WEBKIT_PLUGINS_PPAPI_V8_VAR_CONVERTER_H
 #define WEBKIT_PLUGINS_PPAPI_V8_VAR_CONVERTER_H
 
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ppapi/c/pp_var.h"
 #include "v8/include/v8.h"
 #include "webkit/plugins/webkit_plugins_export.h"
 
 namespace webkit {
 namespace ppapi {
+namespace V8VarConverter {
 
-// Class to convert between PP_Vars and V8 values.
-class WEBKIT_PLUGINS_EXPORT V8VarConverter {
- public:
-  V8VarConverter();
+// Converts the given PP_Var to a v8::Value. True is returned upon success.
+bool WEBKIT_PLUGINS_EXPORT ToV8Value(const PP_Var& var,
+                                     v8::Handle<v8::Context> context,
+                                     v8::Handle<v8::Value>* result);
+// Converts the given v8::Value to a PP_Var. True is returned upon success.
+// Every PP_Var in the reference graph of which |result| is apart will have
+// a refcount equal to the number of references to it in the graph. |result|
+// will have one additional reference.
+bool WEBKIT_PLUGINS_EXPORT FromV8Value(v8::Handle<v8::Value> val,
+                                       v8::Handle<v8::Context> context,
+                                       PP_Var* result);
 
-  // Converts the given PP_Var to a v8::Value. True is returned upon success.
-  bool ToV8Value(const PP_Var& var,
-                 v8::Handle<v8::Context> context,
-                 v8::Handle<v8::Value>* result) const;
-  // Converts the given v8::Value to a PP_Var. True is returned upon success.
-  // Every PP_Var in the reference graph of which |result| is apart will have
-  // a refcount equal to the number of references to it in the graph. |result|
-  // will have one additional reference.
-  bool FromV8Value(v8::Handle<v8::Value> val,
-                   v8::Handle<v8::Context> context,
-                   PP_Var* result) const;
-
-  DISALLOW_COPY_AND_ASSIGN(V8VarConverter);
-};
-
+}  // namespace V8VarConverter
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_V8_VAR_CONVERTER_H