Remove WebUI favicon support on iOS

ios/web/BUILD.gn

 # Copyright 2015 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("//ios/build/config.gni")
 import("//ios/web/js_compile.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 
 group("all_tests") {
@@ skipping 572 matching lines @@
 
 js_compile_bundle("web_ui_bundle") {
   visibility = [ ":js_resources" ]
   closure_entry_point = "__crWeb.webUIBundle"
 
   sources = [
     "../third_party/requirejs/require.js",
     "webui/resources/web_ui_base.js",
     "webui/resources/web_ui_bind.js",
     "webui/resources/web_ui_bundle.js",
-    "webui/resources/web_ui_favicons.js",
     "webui/resources/web_ui_module_load_notifier.js",
     "webui/resources/web_ui_send.js",
   ]
 }
 
 js_compile_bundle("web_bundle") {
   visibility = [ ":js_resources" ]
   closure_entry_point = "__crWeb.webBundle"
 
   sources = [
@@ skipping 21 matching lines @@
 }
 
 grit("resources") {
   source = "ios_web_resources.grd"
   use_qualified_include = true
   outputs = [
     "grit/ios_web_resources.h",
     "ios_web_resources.pak",
   ]
 }