Remove unused parts of IPC::ChannelHandle.

chrome/browser/printing/printing_message_filter.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 "chrome/browser/printing/printing_message_filter.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 
@@ skipping 10 matching lines @@
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/child_process_host.h"
 #include "printing/features/features.h"
 
 #if BUILDFLAG(ENABLE_PRINT_PREVIEW)
 #include "chrome/browser/ui/webui/print_preview/print_preview_ui.h"
 #endif
 
 #if defined(OS_ANDROID)
+#include "base/file_descriptor_posix.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/printing/print_view_manager_basic.h"
 #endif
 
 using content::BrowserThread;
 
 namespace printing {
 
 namespace {
 
@@ skipping 269 matching lines @@
 void PrintingMessageFilter::OnCheckForCancel(int32_t preview_ui_id,
                                              int preview_request_id,
                                              bool* cancel) {
   PrintPreviewUI::GetCurrentPrintPreviewStatus(preview_ui_id,
                                                preview_request_id,
                                                cancel);
 }
 #endif
 
 }  // namespace printing