Add ipc_channel_nacl to the untrusted build and fix all compile/link errors.

ipc/ipc_channel.cc

Index: ipc/ipc_channel.cc
===================================================================
--- ipc/ipc_channel.cc	(revision 133452)
+++ ipc/ipc_channel.cc	(working copy)
@@ -30,8 +30,14 @@
   // component. The strong random component prevents other processes from
   // hijacking or squatting on predictable channel names.
 
+  int process_id;
+#if !defined(OS_NACL)
+  process_id = base::GetCurrentProcId();
+#else
+  process_id = 0;
+#endif
   return base::StringPrintf("%d.%u.%d",
-      base::GetCurrentProcId(),
+      process_id,
       g_last_id.GetNext(),
       base::RandInt(0, std::numeric_limits<int32>::max()));
 }