Remove duplicate icu_code config added in https://codereview.chromium.org/1224463003/

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("//third_party/icu/config.gni")
 
 # Meta target that includes both icuuc and icui18n. Most targets want both.
 # You can depend on the individually if you need to.
 group("icu") {
   deps = [
@@ skipping 482 matching lines @@
   configs -= [
     "//build/config/compiler:no_rtti",  # ICU uses RTTI.
     "//build/config/compiler:chromium_code",
   ]
   configs += [
     "//build/config/compiler:rtti",
     "//build/config/compiler:no_chromium_code",
   ]
   configs += [ ":icu_code" ]
 
-  configs += [ ":icu_code" ]
   public_configs = [ ":icu_config" ]
 
   if (is_win || icu_use_data_file) {
     sources += [ "source/stubdata/stubdata.c" ]
     defines += [ "U_ICUDATAENTRY_IN_COMMON" ]
   }
 }
 
 # TODO(GYP) support use_system_icu.
 if (icu_use_data_file) {
@@ skipping 57 matching lines @@
         sources = [
           "android/icudtl_dat.S",
         ]
       } else {
         assert(false, "No icu data for this platform")
       }
       defines = [ "U_HIDE_DATA_SYMBOL" ]
     }
   }
 }