Move base::FreeDeleter into its own header.

components/exo/wayland/server.cc

 // Copyright 2015 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 "components/exo/wayland/server.h"
 
 #include <grp.h>
 #include <linux/input.h>
 #include <scaler-server-protocol.h>
 #include <secure-output-unstable-v1-server-protocol.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <wayland-server-core.h>
 #include <wayland-server-protocol-core.h>
 #include <xdg-shell-unstable-v5-server-protocol.h>
 
 #include <algorithm>
 #include <iterator>
 #include <string>
 #include <utility>
 
 #include "ash/display/display_info.h"
 #include "ash/display/display_manager.h"
 #include "ash/display/screen_ash.h"
 #include "ash/shell.h"
 #include "base/bind.h"
 #include "base/cancelable_callback.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
+#include "base/memory/free_deleter.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/exo/buffer.h"
 #include "components/exo/display.h"
 #include "components/exo/keyboard.h"
 #include "components/exo/keyboard_delegate.h"
 #include "components/exo/pointer.h"
 #include "components/exo/pointer_delegate.h"
 #include "components/exo/shared_memory.h"
 #include "components/exo/shell_surface.h"
@@ skipping 2088 matching lines @@
   DCHECK(event_loop);
   wl_event_loop_dispatch(event_loop, timeout.InMilliseconds());
 }
 
 void Server::Flush() {
   wl_display_flush_clients(wl_display_.get());
 }
 
 }  // namespace wayland
 }  // namespace exo