Unify var tracking between webkit and the proxy.

ppapi/proxy/ppb_file_ref_proxy.cc

 // 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.
 
 #include "ppapi/proxy/ppb_file_ref_proxy.h"
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_file_ref.h"
 #include "ppapi/c/private/ppb_proxy_private.h"
 #include "ppapi/proxy/enter_proxy.h"
@@ skipping 57 matching lines @@
     : PluginResource(info.resource) {
   Dispatcher* dispatcher = PluginDispatcher::GetForInstance(instance());
 
   file_system_type_ = static_cast<PP_FileSystemType>(info.file_system_type);
 
   name_ = ReceiveSerializedVarReturnValue(info.name).Return(dispatcher);
   path_ = ReceiveSerializedVarReturnValue(info.path).Return(dispatcher);
 }
 
 FileRef::~FileRef() {
-  PluginVarTracker::GetInstance()->Release(path_);
-  PluginVarTracker::GetInstance()->Release(name_);
+  PluginVarTracker& var_tracker =
+      PluginResourceTracker::GetInstance()->var_tracker();
+  var_tracker.ReleaseVar(path_);
+  var_tracker.ReleaseVar(name_);
 }
 
 PPB_FileRef_API* FileRef::AsPPB_FileRef_API() {
   return this;
 }
 
 PP_FileSystemType FileRef::GetFileSystemType() const {
   return file_system_type_;
 }
 
 PP_Var FileRef::GetName() const {
-  PluginVarTracker::GetInstance()->AddRef(name_);
+  PluginResourceTracker::GetInstance()->var_tracker().AddRefVar(name_);
   return name_;
 }
 
 PP_Var FileRef::GetPath() const {
-  PluginVarTracker::GetInstance()->AddRef(path_);
+  PluginResourceTracker::GetInstance()->var_tracker().AddRefVar(path_);
   return path_;
 }
 
 PP_Resource FileRef::GetParent() {
   PPBFileRef_CreateInfo create_info;
   GetDispatcher()->Send(new PpapiHostMsg_PPBFileRef_GetParent(
       INTERFACE_ID_PPB_FILE_REF, host_resource(), &create_info));
   return PPB_FileRef_Proxy::DeserializeFileRef(create_info);
 }
 
@@ skipping 187 matching lines @@
     return;
   PP_CompletionCallback callback = ReceiveCallback(serialized_callback);
   int32_t result = enter.object()->Rename(new_file_ref.host_resource(),
                                           callback);
   if (result != PP_OK_COMPLETIONPENDING)
     PP_RunCompletionCallback(&callback, result);
 }
 
 }  // namespace proxy
 }  // namespace pp