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

third_party/libc++abi/libc++abi.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': 'libc++abi',
-      'type': 'shared_library',
-      'variables': {
-        'prune_self_dependency': 1,
-        # Don't add this target to the dependencies of targets with type=none.
-        'link_dependency': 1,
-      },
+      'type': 'static_library',
       'dependencies=': [],
       'sources': [
         'trunk/src/abort_message.cpp',
         'trunk/src/cxa_aux_runtime.cpp',
         'trunk/src/cxa_default_handlers.cpp',
         'trunk/src/cxa_demangle.cpp',
         'trunk/src/cxa_exception.cpp',
         'trunk/src/cxa_exception_storage.cpp',
         'trunk/src/cxa_guard.cpp',
         'trunk/src/cxa_handlers.cpp',
@@ skipping 24 matching lines @@
         '-Wmismatched-tags',
         '-Wmissing-braces',
         '-Wshorten-64-to-32',
         '-Wsign-compare',
         '-Wstrict-aliasing=2',
         '-Wstrict-overflow=4',
         '-Wunused-parameter',
         '-Wnewline-eof',
         '-nostdinc++',
       ],
-      'direct_dependent_settings': {
-        'target_conditions': [
-          ['_type!="none"', {
-            'include_dirs': [
-              'trunk/include',
-            ],
-            'cflags_cc': [
-              '-nostdinc++',
-            ],
-            'ldflags': [
-              '-L<(PRODUCT_DIR)/lib/',
-            ],
-          }],
-        ],
-      },
       'cflags_cc!': [
         '-fno-rtti',
       ],
       'cflags!': [
         '-fno-exceptions',
         '-fvisibility=hidden',
       ],
       'ldflags': [
         '-nodefaultlibs',
       ],
       'ldflags!': [
         '-pthread',
       ],
       'libraries': [
         '-lrt',
         '-lgcc_s',
         '-lpthread',
         '-lc',
       ]
     },
   ]
 }