Miscellaneous fixes for system libraries files:

build/linux/unbundle/icu.gyp

 # Copyright 2013 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.
 
 {
   'targets': [
     {
       'target_name': 'system_icu',
       'type': 'none',
+      'direct_dependent_settings': {
+        'defines': [
+          'U_USING_ICU_NAMESPACE=0',
+        ],
+      },
       'link_settings': {
         'ldflags': [
           '<!@(icu-config --ldflags)',
         ],
         'libraries': [
           '<!@(icu-config --ldflags-libsonly)',
         ],
       },
     },
     {
@@ skipping 187 matching lines @@
           'unicode/uvernum.h',
           'unicode/uversion.h',
         ],
       },
       'includes': [
         '../../build/shim_headers.gypi',
       ],
     },
   ],
 }