Add libc++ and libc++abi to third-party.

media/media_untrusted.gyp

Index: media/media_untrusted.gyp
===================================================================
--- media/media_untrusted.gyp	(revision 239156)
+++ media/media_untrusted.gyp	(working copy)
@@ -38,6 +38,14 @@
           'sources': [
             '<@(shared_memory_support_sources)',
           ],
+          'conditions': [
+            ['use_libcxx==1', {
+              'dependencies!': [
+                '<(DEPTH)/third_party/libc++/libc++.gyp:libc++',
+                '<(DEPTH)/third_party/libc++abi/libc++abi.gyp:libc++abi',

[bradn, 2013/12/06 18:11:20]

I think it would be good to avoid requiring this in every untrusted target
(which are an unbounded set), if at all possible. I'm going to suggest an idea
for how in another location for context.

+              ],
+            }],
+          ],
         },
       ],
     }],