Add an untrusted NaCl build for IPC.

ipc/ipc.gypi

Index: ipc/ipc.gypi
===================================================================
--- ipc/ipc.gypi	(revision 141739)
+++ ipc/ipc.gypi	(working copy)
@@ -16,6 +16,8 @@
           'ipc_channel.h',
           'ipc_channel.cc',
           'ipc_channel_handle.h',
+          'ipc_channel_nacl.cc',
+          'ipc_channel_nacl.h',
           'ipc_channel_posix.cc',
           'ipc_channel_posix.h',
           'ipc_channel_proxy.cc',
@@ -59,56 +61,14 @@
         'include_dirs': [
           '..',
         ],
+        'target_conditions': [
+          ['>(nacl_untrusted_build)==1', {
+            'sources!': [
+              'ipc_channel_posix.cc',
+            ],
+          }],
+        ],
       }],
     ],
   },
-  'targets': [
-    {
-      'target_name': 'ipc',
-      'type': '<(component)',
-      'variables': {
-        'ipc_target': 1,
-      },
-      'dependencies': [
-        '../base/base.gyp:base',
-        '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
-      ],
-      # TODO(gregoryd): direct_dependent_settings should be shared with the
-      # 64-bit target, but it doesn't work due to a bug in gyp
-      'direct_dependent_settings': {
-        'include_dirs': [
-          '..',
-        ],
-      },
-    },
-  ],
-  'conditions': [
-    ['OS=="win"', {
-      'targets': [
-        {
-          'target_name': 'ipc_win64',
-          'type': '<(component)',
-          'variables': {
-            'ipc_target': 1,
-          },
-          'dependencies': [
-            '../base/base.gyp:base_nacl_win64',
-            '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations_win64',
-          ],
-          # TODO(gregoryd): direct_dependent_settings should be shared with the
-          # 32-bit target, but it doesn't work due to a bug in gyp
-          'direct_dependent_settings': {
-            'include_dirs': [
-              '..',
-            ],
-          },
-          'configurations': {
-            'Common_Base': {
-              'msvs_target_platform': 'x64',
-            },
-          },
-        },
-      ],
-    }],
-  ],
 }