[counting_allocator] Chrome changes.

build/config/compiler/BUILD.gn

 # Copyright (c) 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/nacl/config.gni")
 import("//build/toolchain/cc_wrapper.gni")
 import("//build/toolchain/toolchain.gni")
@@ skipping 432 matching lines @@
     cflags_cc += [ "-std=gnu++11" ]
   } else if (!is_win && !is_nacl) {
     # TODO(mcgrathr) - the NaCl GCC toolchain doesn't support either gnu++11
     # or c++11; we technically don't need this toolchain any more, but there
     # are still a few buildbots using it, so until those are turned off
     # we need the !is_nacl clause and the (is_nacl && is_clang) clause, above.
     cflags_cc += [ "-std=c++11" ]
   }
 
   if (is_mac) {
-    cflags_cc += [ "-stdlib=libc++" ]
-    ldflags += [ "-stdlib=libc++" ]
+    if (true) {
+      cflags_cc += [
+        "-nostdinc++",
+        "-isystem" + rebase_path("//buildtools/third_party/libc++/trunk/include", root_build_dir),
+        "-isystem" + rebase_path("//buildtools/third_party/libc++abi/trunk/include", root_build_dir),
+      ]
+    } else {
+      cflags_cc += [ "-stdlib=libc++" ]
+      ldflags += [ "-stdlib=libc++" ]
+    }
   }
 
   # Add flags for link-time optimization. These flags enable
   # optimizations/transformations that require whole-program visibility at link
   # time, so they need to be applied to all translation units, and we may end up
   # with miscompiles if only part of the program is compiled with LTO flags. For
   # that reason, we cannot allow targets to enable or disable these flags, for
   # example by disabling the optimize configuration.
   # TODO(pcc): Make this conditional on is_official_build rather than on gn
   # flags for specific features.
@@ skipping 1238 matching lines @@
 
 if (is_ios || is_mac) {
   # On Mac and iOS, this enables support for ARC (automatic ref-counting).
   # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html.
   config("enable_arc") {
     common_flags = [ "-fobjc-arc" ]
     cflags_objc = common_flags
     cflags_objcc = common_flags
   }
 }