Base: Make base::File use ScopedFD on POSIX.

base/files/file.h

 // 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.
 
 #ifndef BASE_FILES_FILE_H_
 #define BASE_FILES_FILE_H_
 
 #include "build/build_config.h"
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
+#include "base/files/scoped_file.h"
 #include "base/move.h"
 #include "base/time/time.h"
 
 #if defined(OS_WIN)
 #include "base/win/scoped_handle.h"
 #endif
 
 namespace base {
 
 class FilePath;
@@ skipping 145 matching lines @@
   // FLAG_CREATE_ALWAYS), and false otherwise.
   bool created() const { return created_; }
 
   // Returns the OS result of opening this file. Note that the way to verify
   // the success of the operation is to use IsValid(), not this method:
   //   File file(name, flags);
   //   if (!file.IsValid())
   //     return;
   Error error_details() const { return error_details_; }
 
-  PlatformFile GetPlatformFile() const { return file_; }
+  PlatformFile GetPlatformFile() const;
   PlatformFile TakePlatformFile();
 
   // Destroying this object closes the file automatically.
   void Close();
 
   // Changes current position in the file to an |offset| relative to an origin
   // defined by |whence|. Returns the resultant current position in the file
   // (relative to the start) or -1 in case of error.
   int64 Seek(Whence whence, int64 offset);
 
@@ skipping 78 matching lines @@
 #elif defined(OS_POSIX)
   static Error OSErrorToFileError(int saved_errno);
 #endif
 
  private:
   void SetPlatformFile(PlatformFile file);
 
 #if defined(OS_WIN)
   win::ScopedHandle file_;
 #elif defined(OS_POSIX)
-  PlatformFile file_;
+  ScopedFD file_;
 #endif
 
   Error error_details_;
   bool created_;
   bool async_;
 };
 
 }  // namespace base
 
 #endif  // BASE_FILES_FILE_H_