Add U_DISABLE_RENAMING define and set 1.

icu.gyp

 # Copyright (c) 2012 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.
 
 {
   'includes': [
     'icu.gypi',
   ],
   'variables': {
     'use_system_icu%': 0,
     'icu_use_data_file_flag%': 0,
     'want_separate_host_toolset%': 1,
   },
   'target_defaults': {
     'direct_dependent_settings': {
       'defines': [
         # Tell ICU to not insert |using namespace icu;| into its headers,
         # so that chrome's source explicitly has to use |icu::|.
         'U_USING_ICU_NAMESPACE=0',
+        'U_DISABLE_RENAMING=1',
       ],
     },
     'defines': [
       'U_USING_ICU_NAMESPACE=0',
+      'U_DISABLE_RENAMING=1',
     ],
     'conditions': [
       ['component=="static_library"', {
         'defines': [
           'U_STATIC_IMPLEMENTATION',
         ],
       }],
       ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
          or OS=="netbsd" or OS=="mac" or OS=="android" or OS=="qnx") and \
         (target_arch=="arm" or target_arch=="ia32" or \
@@ skipping 561 matching lines @@
           },
           'includes': [
             '../../build/shim_headers.gypi',
           ],
           'toolsets': ['target'],
         },
       ], # targets
     }],
   ], # conditions
 }