Change the way libc++ is linked when use_custom_libcxx=1.

base/base.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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 956 matching lines @@
       'include_dirs': [
         '..',
       ],
       # Some targets may want to opt-out from ASan, TSan and MSan and link
       # without the corresponding runtime libraries. We drop the libc++
       # dependency and omit the compiler flags to avoid bringing instrumented
       # code to those targets.
       'conditions': [
         ['use_custom_libcxx==1', {
           'dependencies!': [
-            '../third_party/libc++/libc++.gyp:libc++',
-            '../third_party/libc++abi/libc++abi.gyp:libc++abi',
+            '../third_party/libc++/libc++.gyp:libcxx_proxy',
           ],
         }],
       ],
       'cflags!': [
         '-fsanitize=address',
         '-fsanitize=thread',
         '-fsanitize=memory',
         '-fsanitize-memory-track-origins',
       ],
       'direct_dependent_settings': {
@@ skipping 458 matching lines @@
             'base_unittests.isolate',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }