Convert Spellcheck host MessageFilter IPC to mojo

chrome/test/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/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 3667 matching lines @@
       "../browser/background/background_contents_service_unittest.cc",
       "../browser/background/background_mode_manager_unittest.cc",
       "../browser/background/background_mode_optimizer_unittest.cc",
     ]
   }
 
   if (enable_spellcheck) {
     sources += [
       "../browser/spellchecker/spellcheck_custom_dictionary_unittest.cc",
       "../browser/spellchecker/spellcheck_message_filter_platform_mac_unittest.cc",
-      "../browser/spellchecker/spellcheck_message_filter_unittest.cc",
       "../browser/spellchecker/spellcheck_service_unittest.cc",
       "../browser/spellchecker/spelling_service_client_unittest.cc",
       "../tools/convert_dict/convert_dict_unittest.cc",
     ]
+
+    if (!use_browser_spellchecker) {
+      sources += [ "../browser/spellchecker/spellcheck_host_impl_unittest.cc" ]
+    }
   }
 
   if (enable_one_click_signin) {
     sources += [
       "../browser/ui/sync/one_click_signin_sync_observer_unittest.cc",
       "../browser/ui/sync/one_click_signin_sync_starter_unittest.cc",
     ]
   }
 
   if (enable_extensions) {
@@ skipping 1326 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }