Pass StatsTable shared memory via global descriptors on Posix rather than using named shared memory.

components/nacl/zygote/nacl_fork_delegate_linux.cc

Index: components/nacl/zygote/nacl_fork_delegate_linux.cc
diff --git a/components/nacl/zygote/nacl_fork_delegate_linux.cc b/components/nacl/zygote/nacl_fork_delegate_linux.cc
index d94ad6b9fdfe5237b92fd6592eed54338da34a78..16fd30ce8941259747ce7a610daf73baa7012671 100644
--- a/components/nacl/zygote/nacl_fork_delegate_linux.cc
+++ b/components/nacl/zygote/nacl_fork_delegate_linux.cc
@@ -110,10 +110,6 @@ void NaClForkDelegate::Init(const int sandboxdesc) {
   VLOG(1) << "NaClForkDelegate::Init()";
   int fds[2];
 
-  // Confirm a hard-wired assumption.
-  // The NaCl constant is from chrome/nacl/nacl_linux_helper.h
-  DCHECK(kNaClSandboxDescriptor == sandboxdesc);
-
   CHECK(socketpair(PF_UNIX, SOCK_SEQPACKET, 0, fds) == 0);
   base::FileHandleMappingVector fds_to_map;
   fds_to_map.push_back(std::make_pair(fds[1], kNaClZygoteDescriptor));
@@ -257,8 +253,7 @@ bool NaClForkDelegate::CanHelp(const std::string& process_type,
 
 pid_t NaClForkDelegate::Fork(const std::vector<int>& fds) {
   VLOG(1) << "NaClForkDelegate::Fork";
-
-  DCHECK(fds.size() == kNaClParentFDIndex + 1);
+  DCHECK(fds.size() == kNaClParentFDIndex(fds.size()) + 1);
 
   // First, send a remote fork request.
   Pickle write_pickle;