Temporarily exclude extension_tab_util impl

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")
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
@@ skipping 86 matching lines @@
         gypi_values.chrome_browser_extensions_non_chromeos_sources,
         ".", "//chrome")
   }
 
   if (use_ash) {
     sources += [
       "api/tabs/ash_panel_contents.cc",
       "api/tabs/ash_panel_contents.h",
     ]
   }
+  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_linux) {
     configs += [ "//build/config/linux:fontconfig" ]
     deps += [ "//dbus" ]
     if (use_x11) {
       configs += [
         "//build/config/linux:x11",
       ]
       deps += [
         "//ui/events:events_base",
@@ skipping 83 matching lines @@
         gypi_values.chrome_browser_extensions_app_list_sources,
         ".", "//chrome")
   }
 
   if (!use_ozone) {
     sources -= [
       "global_shortcut_listener_ozone.cc",
     ]
   }
 }