Base: Make FileProxy automaticaly close the file on a worker thread.

base/files/file.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 "base/files/file.h"
 
 // TODO(rvargas): remove this (needed for kInvalidPlatformFileValue).
 #include "base/platform_file.h"
 
 namespace base {
@@ skipping 42 matching lines @@
 }
 
 File::File(RValue other)
     : file_(other.object->TakePlatformFile()),
       error_details_(other.object->error_details()),
       created_(other.object->created()),
       async_(other.object->async_) {
 }
 
 File::~File() {
+  // Go through the AssertIOAllowed logic.
+  Close();
 }
 
 File& File::operator=(RValue other) {
   if (this != other.object) {
     Close();
     SetPlatformFile(other.object->TakePlatformFile());
     error_details_ = other.object->error_details();
     created_ = other.object->created();
     async_ = other.object->async_;
   }
   return *this;
 }
 
 #if !defined(OS_NACL)
 void File::Initialize(const FilePath& name, uint32 flags) {
   if (name.ReferencesParent()) {
     error_details_ = FILE_ERROR_ACCESS_DENIED;
     return;
   }
   InitializeUnsafe(name, flags);
 }
 #endif
 
 }  // namespace base