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

ppapi/cpp/dev/transport_dev.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_DEV_TRANSPORT_DEV_H_
 #define PPAPI_CPP_DEV_TRANSPORT_DEV_H_
 
 #include "ppapi/c/dev/ppb_transport_dev.h"
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/cpp/resource.h"
 
 namespace pp {
 
-class Instance;
+class InstanceHandle;
 class Var;
 
 class Transport_Dev : public Resource {
  public:
-  Transport_Dev(Instance* instance, const char* name, PP_TransportType type);
+  Transport_Dev(const InstanceHandle& instance,
+                const char* name,
+                PP_TransportType type);
 
   bool IsWritable();
   int32_t SetProperty(PP_TransportProperty property, const Var& value);
   int32_t Connect(const CompletionCallback& cc);
   int32_t GetNextAddress(pp::Var* address, const CompletionCallback& cc);
   int32_t ReceiveRemoteAddress(const pp::Var& address);
   int32_t Recv(void* data, uint32_t len,
                const CompletionCallback& cc);
   int32_t Send(const void* data, uint32_t len,
                const CompletionCallback& cb);
   int32_t Close();
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_TRANSPORT_DEV_H_