[ios] Remove IDC_CLOSE_TAB

ios/chrome/browser/ui/commands/BUILD.gn

 # Copyright 2016 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.
 
 source_set("commands") {
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "UIKit+ChromeExecuteCommand.h",
     "UIKit+ChromeExecuteCommand.mm",
+    "browser_commands.h",
     "clear_browsing_data_command.h",
     "clear_browsing_data_command.mm",
     "generic_chrome_command.h",
     "generic_chrome_command.mm",
     "ios_command_ids.h",
     "open_url_command.h",
     "open_url_command.mm",
     "reading_list_add_command.h",
     "reading_list_add_command.mm",
     "set_up_for_testing_command.h",
@@ skipping 19 matching lines @@
   sources = [
     "set_up_for_testing_command_unittest.mm",
   ]
   deps = [
     ":commands",
     "//base",
     "//testing/gtest",
     "//url",
   ]
 }