Use a stub implementation of GlobalShortcutListener for Athena

chrome/browser/extensions/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/ui.gni")
 
 assert(enable_extensions)
 
@@ skipping 101 matching lines @@
   }
   if (use_athena) {
     defines += [ USE_ATHENA ]
     sources += rebase_path(
       gypi_values.chrome_browser_extensions_athena_sources,
         ".", "//chrome")
   } else {
     sources += rebase_path(
       gypi_values.chrome_browser_extensions_non_athena_sources,
         ".", "//chrome")
+    if (is_chromeos) {
+      sources += rebase_path(
+        gypi_values.chrome_browser_extensions_chromeos_non_athena_sources,
+        ".", "//chrome")
+    }
   }
 
   if (is_linux) {
     configs += [ "//build/config/linux:fontconfig" ]
     deps += [ "//dbus" ]
     if (use_x11) {
       configs += [
         "//build/config/linux:x11",
       ]
       deps += [
@@ skipping 91 matching lines @@
         gypi_values.chrome_browser_extensions_app_list_sources,
         ".", "//chrome")
   }
 
   if (!use_ozone) {
     sources -= [
       "global_shortcut_listener_ozone.cc",
     ]
   }
 }