Remove MOJO_SHELL_CLIENT define.

content/app/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/features.gni")
 
 # Implements "content_main" given the defines and visibility. On Windows this
 # is compiled with a different define for browser and child, but all code needs
 # to be shared.
 template("implement_content_app") {
   runner_target_name = "content_main_runner_" + target_name
   main_target_name = target_name
 
   extra_configs = [
     "//build/config/compiler:wexit_time_destructors",
     "//content:content_implementation",
-    "//content/public/common:mojo_shell_client",
     "//v8:external_startup_data",
   ]
 
   content_app_deps = [
     "//base",
     "//base:i18n",
     "//components/tracing:startup_tracing",
     "//content:export",
     "//content:sandbox_helper_win",
     "//content/public/common:common_sources",
@@ skipping 130 matching lines @@
   implement_content_app("browser") {
     visibility = [ "//content/public/app:browser" ]
     defines = [ "CHROME_MULTIPLE_DLL_BROWSER" ]
   }
 
   implement_content_app("child") {
     visibility = [ "//content/public/app:child" ]
     defines = [ "CHROME_MULTIPLE_DLL_CHILD" ]
   }
 }