Convert Spellcheck host MessageFilter IPC to mojo

chrome/browser/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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 1979 matching lines @@
     if (!use_aura || is_win || is_chromeos) {
       sources -= [ "background/background_mode_manager_aura.cc" ]
     }
   }
   if (enable_spellcheck) {
     sources += [
       "spellchecker/spellcheck_custom_dictionary.cc",
       "spellchecker/spellcheck_custom_dictionary.h",
       "spellchecker/spellcheck_factory.cc",
       "spellchecker/spellcheck_factory.h",
+      "spellchecker/spellcheck_host_impl.cc",
+      "spellchecker/spellcheck_host_impl.h",
       "spellchecker/spellcheck_hunspell_dictionary.cc",
       "spellchecker/spellcheck_hunspell_dictionary.h",
-      "spellchecker/spellcheck_message_filter.cc",
-      "spellchecker/spellcheck_message_filter.h",
       "spellchecker/spellcheck_message_filter_platform_mac.cc",
       "spellchecker/spellcheck_service.cc",
       "spellchecker/spellcheck_service.h",
     ]
     deps += [
       "//components/spellcheck/browser",
       "//components/spellcheck/common:common",
     ]
 
     if (!is_android) {
@@ skipping 2682 matching lines @@
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }
 
 service_manifest("preferences_forwarder_manifest") {
   name = "preferences_forwarder"
   source = "prefs/forwarder_manifest.json"
 }