Convert utility process ImageWriter IPC to mojo

chrome/utility/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/sysroot.gni")
 import("//extensions/features/features.gni")
 import("//printing/features/features.gni")
 
 static_library("utility") {
   sources = [
     "chrome_content_utility_client.cc",
     "chrome_content_utility_client.h",
-    "chrome_content_utility_ipc_whitelist.cc",
-    "chrome_content_utility_ipc_whitelist.h",
     "cloud_print/bitmap_image.cc",
     "cloud_print/bitmap_image.h",
     "cloud_print/pwg_encoder.cc",
     "cloud_print/pwg_encoder.h",
     "ipc_shell_handler_win.cc",
     "ipc_shell_handler_win.h",
     "printing_handler.cc",
     "printing_handler.h",
     "shell_handler_impl_win.cc",
     "shell_handler_impl_win.h",
@@ skipping 146 matching lines @@
     sources -= [
       "printing_handler.cc",
       "printing_handler.h",
     ]
   }
 
   if (is_mac && safe_browsing_mode == 1) {
     deps += [ "//chrome/utility/safe_browsing/mac" ]
   }
 }