Remove task.h and finish base::Bind() migration.

ppapi/proxy/ppb_var_deprecated_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_var_deprecated_proxy.h"
 
 #include <stdlib.h>  // For malloc
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
-#include "base/task.h"
 #include "ppapi/c/dev/ppb_var_deprecated.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/c/ppb_var.h"
 #include "ppapi/c/ppb_core.h"
 #include "ppapi/proxy/host_dispatcher.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/plugin_globals.h"
 #include "ppapi/proxy/plugin_resource_tracker.h"
 #include "ppapi/proxy/plugin_var_tracker.h"
 #include "ppapi/proxy/ppapi_messages.h"
@@ skipping 480 matching lines @@
 }
 
 void PPB_Var_Deprecated_Proxy::DoReleaseObject(int64 object_id) {
   PP_Var var = { PP_VARTYPE_OBJECT };
   var.value.as_id = object_id;
   ppb_var_impl_->Release(var);
 }
 
 }  // namespace proxy
 }  // namespace ppapi