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

ppapi/proxy/raw_var_data.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 PPAPI_PROXY_RAW_VAR_DATA_H_
 #define PPAPI_PROXY_RAW_VAR_DATA_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 47 matching lines @@
   ~RawVarDataGraph();
 
   // Construct a new PP_Var from the graph. All of the PP_Vars referenced by
   // the returned PP_Var are also constructed. Each PP_Var created has a
   // ref-count equal to the number of references it has in the graph of vars.
   // The returned var (the "root") has one additional reference.
   PP_Var CreatePPVar(PP_Instance instance);
 
   // Write the graph to a message using the given HandleWriter.
   void Write(IPC::Message* m, const HandleWriter& handle_writer);
-  // Write the graph to a message using the default handle writer.
-  void Write(IPC::Message* m);
 
   // Create a RawVarDataGraph from the given message.
   static scoped_ptr<RawVarDataGraph> Read(const IPC::Message* m,
                                           PickleIterator* iter);
 
   // Returns a vector of SerializedHandles associated with this RawVarDataGraph.
   // Ownership of the pointers remains with the elements of the RawVarDataGraph.
   std::vector<SerializedHandle*> GetHandles();
 
   // Sets the threshold size at which point we switch from transmitting
@@ skipping 174 matching lines @@
                     PickleIterator* iter) OVERRIDE;
 
  private:
   std::vector<std::pair<std::string, size_t> > children_;
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_RAW_VAR_DATA_H_