PPAPI/NaCl: Make NaClIPCAdapter transfer handles more generally

ppapi/proxy/ppb_file_io_proxy.cc

 // Copyright (c) 2012 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_io_proxy.h"
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/proxy/enter_proxy.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/ppb_file_ref_proxy.h"
@@ skipping 310 matching lines @@
   }
 }
 
 void PPB_FileIO_Proxy::OnHostMsgWrite(const HostResource& host_resource,
                                       int64_t offset,
                                       const std::string& data) {
   EnterHostFileIO enter(host_resource, callback_factory_,
                         &PPB_FileIO_Proxy::GeneralCallbackCompleteInHost,
                         host_resource);
   if (enter.succeeded()) {
-    enter.SetResult(enter.object()->Write(offset, data.data(), data.size(),
+    enter.SetResult(enter.object()->Write(offset, data.data(),
+                                          static_cast<int32_t>(data.size()),
                                           enter.callback()));
   }
 }
 
 void PPB_FileIO_Proxy::OnHostMsgSetLength(const HostResource& host_resource,
                                           int64_t length) {
   EnterHostFileIO enter(host_resource, callback_factory_,
                         &PPB_FileIO_Proxy::GeneralCallbackCompleteInHost,
                         host_resource);
   if (enter.succeeded())
@@ skipping 99 matching lines @@
     DCHECK(pp_error <= static_cast<int32_t>(data->size()));
     data->resize(pp_error);
   }
   Send(new PpapiMsg_PPBFileIO_ReadComplete(kApiID, host_resource, pp_error,
                                            *data));
   delete data;
 }
 
 }  // namespace proxy
 }  // namespace ppapi