Use all_dependent_settings to apply libc++ flags.

third_party/libc++/libc++.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': 'libcxx_proxy',
       'type': 'none',
       'dependencies=': [
         'libc++',
       ],
       # Do not add dependency on libc++.so to dependents of this target. We
       # don't want to pass libc++.so on the command line to the linker, as that
       # would cause it to be linked into C executables which don't need it.
       # Instead, we supply -stdlib=libc++ and let the clang driver decide.
       'dependencies_traverse': 0,
       'variables': {
         # Don't add this target to the dependencies of targets with type=none.
         'link_dependency': 1,
       },
-      'direct_dependent_settings': {
+      'all_dependent_settings': {
         'target_conditions': [
           ['_type!="none"', {
             'include_dirs': [
               'trunk/include',
               '../libc++abi/trunk/include',
             ],
             'cflags_cc': [
               '-nostdinc++',
             ],
             'ldflags': [
@@ skipping 85 matching lines @@
       ],
       'libraries': [
         '-lc',
         '-lgcc_s',
         '-lpthread',
         '-lrt',
       ],
     },
   ]
 }