Fix a crash related to PPAPI scripting.

ppapi/proxy/var_serialization_rules.h

 // Copyright (c) 2012 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_VAR_SERIALIZATION_RULES_H_
 #define PPAPI_PROXY_VAR_SERIALIZATION_RULES_H_
 
-#include "base/memory/scoped_ptr.h"
+#include "base/memory/ref_counted.h"
 #include "ppapi/c/pp_var.h"
 
 #include <string>
 
 namespace ppapi {
 namespace proxy {
 
-class Dispatcher;
-
 // Encapsulates the rules for serializing and deserializing vars to and from
 // the local process. The renderer and the plugin process each have separate
 // bookkeeping rules.
-class VarSerializationRules {
+class VarSerializationRules : public base::RefCounted<VarSerializationRules> {
  public:
   virtual ~VarSerializationRules() {}
 
   // Caller-owned calls --------------------------------------------------------
   //
   // A caller-owned call is when doing a function call with a "normal" input
   // argument. The caller has a reference to the var, and the caller is
   // responsible for freeing that reference.
 
   // Prepares the given var for sending to the remote process. For object vars,
   // the returned var will contain the id valid for the host process.
   // Otherwise, the returned var is valid in the local process.
   virtual PP_Var SendCallerOwned(const PP_Var& var) = 0;
 
   // When receiving a caller-owned variable, normally we don't have to do
   // anything. However, in the case of strings, we need to deserialize the
   // string from IPC, call the function, and then destroy the temporary string.
   // These two functions handle that process.
   //
   // BeginReceiveCallerOwned takes a var from IPC and returns a new var
   // representing the input in the local process.
   //
   // EndReceiveCallerOwned releases the reference count in the Var tracker for
   // the object or string that was added to the tracker. (Note, if the recipient
   // took a reference to the Var, it will remain in the tracker after
   // EndReceiveCallerOwned).
-  virtual PP_Var BeginReceiveCallerOwned(const PP_Var& var,
-                                         Dispatcher* dispatcher) = 0;
+  virtual PP_Var BeginReceiveCallerOwned(const PP_Var& var) = 0;
   virtual void EndReceiveCallerOwned(const PP_Var& var) = 0;
 
   // Passing refs -------------------------------------------------------------
   //
   // A pass-ref transfer is when ownership of a reference is passed from
   // one side to the other. Normally, this happens via return values and
   // output arguments, as for exceptions. The code generating the value
   // (the function returning it in the case of a return value) will AddRef
   // the var on behalf of the consumer of the value. Responsibility for
   // Release is on the consumer (the caller of the function in the case of a
   // return value).
 
   // Creates a var in the context of the local process from the given
   // deserialized var. The input var should be the result of calling
   // SendPassRef in the remote process. The return value is the var valid in
   // the host process for object vars. Otherwise, the return value is a var
   // which is valid in the local process.
-  virtual PP_Var ReceivePassRef(const PP_Var& var,
-                                Dispatcher* dispatcher) = 0;
+  virtual PP_Var ReceivePassRef(const PP_Var& var) = 0;
 
   // Prepares a var to be sent to the remote side. One local reference will
   // be passed to the remote side. Call Begin* before doing the send and End*
   // after doing the send
   //
   // For object vars, the return value from BeginSendPassRef will be the var
   // valid for the host process. Otherwise, it is a var that is valid in the
   // local process. This same var must be passed to EndSendPassRef.
   virtual PP_Var BeginSendPassRef(const PP_Var& var) = 0;
-  virtual void EndSendPassRef(const PP_Var& var, Dispatcher* dispatcher) = 0;
+  virtual void EndSendPassRef(const PP_Var& var) = 0;
 
   // ---------------------------------------------------------------------------
 
   virtual void ReleaseObjectRef(const PP_Var& var) = 0;
 
  protected:
   VarSerializationRules() {}
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_VAR_SERIALIZATION_RULES_H_