Add a default constructor for VarArrayBuffer, so that it can be used by ext::DictField.

ppapi/cpp/extensions/dev/socket_dev.cc

 // Copyright (c) 2013 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/cpp/extensions/dev/socket_dev.h"
 
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/cpp/extensions/optional.h"
 #include "ppapi/cpp/extensions/to_var_converter.h"
 #include "ppapi/cpp/logging.h"
@@ skipping 356 matching lines @@
   return get_interface<PPB_Ext_Socket_Dev_0_1>()->Read(
       instance_.pp_instance(),
       socket_id_var.pp_var(),
       buffer_size_var.pp_var(),
       callback.output(),
       callback.pp_completion_callback());
 }
 
 int32_t Socket_Dev::Write(
     int32_t socket_id,
-    const Var& data,
+    const VarArrayBuffer& data,
     const CompletionCallbackWithOutput<WriteInfo_Dev>& callback) {
   if (!has_interface<PPB_Ext_Socket_Dev_0_1>())
     return callback.MayForce(PP_ERROR_NOINTERFACE);
 
   internal::ToVarConverter<int32_t> socket_id_var(socket_id);
   internal::ToVarConverter<Var> data_var(data);
 
   return get_interface<PPB_Ext_Socket_Dev_0_1>()->Write(
       instance_.pp_instance(),
       socket_id_var.pp_var(),
@@ skipping 15 matching lines @@
   return get_interface<PPB_Ext_Socket_Dev_0_1>()->RecvFrom(
       instance_.pp_instance(),
       socket_id_var.pp_var(),
       buffer_size_var.pp_var(),
       callback.output(),
       callback.pp_completion_callback());
 }
 
 int32_t Socket_Dev::SendTo(
     int32_t socket_id,
-    const Var& data,
+    const VarArrayBuffer& data,
     const std::string& address,
     int32_t port,
     const CompletionCallbackWithOutput<WriteInfo_Dev>& callback) {
   if (!has_interface<PPB_Ext_Socket_Dev_0_1>())
     return callback.MayForce(PP_ERROR_NOINTERFACE);
 
   internal::ToVarConverter<int32_t> socket_id_var(socket_id);
   internal::ToVarConverter<Var> data_var(data);
   internal::ToVarConverter<std::string> address_var(address);
   internal::ToVarConverter<int32_t> port_var(port);
@@ skipping 46 matching lines @@
 
   return get_interface<PPB_Ext_Socket_Dev_0_1>()->GetNetworkList(
       instance_.pp_instance(),
       callback.output(),
       callback.pp_completion_callback());
 }
 
 }  // namespace socket
 }  // namespace ext
 }  // namespace pp