Convert resources to take an instance key instead of an Instance*.

ppapi/cpp/private/var_private.h

 // Copyright (c) 2011 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_CPP_PRIVATE_VAR_PRIVATE_H_
 #define PPAPI_CPP_PRIVATE_VAR_PRIVATE_H_
 
 #include "ppapi/cpp/var.h"
 
 namespace pp {
 
-class InstancePrivate;
+class InstanceHandle;
 
 namespace deprecated {
 class ScriptableObject;
 }
 
 // VarPrivate is a version of Var that exposes the private scripting API.
 // It's designed to be mostly interchangable with Var since most callers will
 // be dealing with Vars from various places.
 class VarPrivate : public Var {
  public:
   VarPrivate() : Var() {}
   VarPrivate(Null) : Var(Null()) {}
   VarPrivate(bool b) : Var(b) {}
   VarPrivate(int32_t i) : Var(i) {}
   VarPrivate(double d) : Var(d) {}
   VarPrivate(const char* utf8_str) : Var(utf8_str) {}
   VarPrivate(const std::string& utf8_str) : Var(utf8_str) {}
   VarPrivate(PassRef, PP_Var var) : Var(PassRef(), var) {}
   VarPrivate(DontManage, PP_Var var) : Var(DontManage(), var) {}
-  VarPrivate(InstancePrivate* instance, deprecated::ScriptableObject* object);
+  VarPrivate(const InstanceHandle& instance,
+             deprecated::ScriptableObject* object);
   VarPrivate(const Var& other) : Var(other) {}
 
   virtual ~VarPrivate() {}
 
   // This assumes the object is of type object. If it's not, it will assert in
   // debug mode. If it is not an object or not a ScriptableObject type, returns
   // NULL.
   deprecated::ScriptableObject* AsScriptableObject() const;
 
   bool HasProperty(const Var& name, Var* exception = NULL) const;
@@ skipping 71 matching lines @@
  private:
   // Prevent an arbitrary pointer argument from being implicitly converted to
   // a bool at Var construction. If somebody makes such a mistake, (s)he will
   // get a compilation error.
   VarPrivate(void* non_scriptable_object_pointer);
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_PRIVATE_VAR_PRIVATE_H_