Stop using chrome-sandbox to determine real pids

content/common/child_process_sandbox_support_impl_linux.cc

Index: content/common/child_process_sandbox_support_impl_linux.cc
diff --git a/content/common/child_process_sandbox_support_impl_linux.cc b/content/common/child_process_sandbox_support_impl_linux.cc
index a810e5c42c005f2bb600ca27af2763ec7c3ebe25..da5365f1012900cbd6582c73c0a5f02b2379a75f 100644
--- a/content/common/child_process_sandbox_support_impl_linux.cc
+++ b/content/common/child_process_sandbox_support_impl_linux.cc
@@ -181,4 +181,32 @@ bool GetFontTable(int fd, uint32_t table_tag, off_t offset,
   return true;
 }
 
+bool SendRealPidToZygote(int fd, base::ProcessId* out_pid) {
+  Pickle request;
+  request.WriteInt(LinuxSandbox::METHOD_GET_REAL_PID);
+  request.WriteBool(out_pid != NULL);
+
+  uint8_t buf[512];
+  const ssize_t n = UnixDomainSocket::SendRecvMsgWithFD(
+      GetSandboxFD(), buf, sizeof(buf), NULL, request, fd);
+  if (n < 0)
+    return false;
+
+  Pickle reply(reinterpret_cast<char*>(buf), n);
+  PickleIterator iter(reply);
+  int real_pid;
+  if (!iter.ReadInt(&real_pid))
+    return false;
+
+  if (out_pid)
+    *out_pid = real_pid;
+  else {
+    // If caller doesn't want to receive its real PID, then make sure the
+    // browser didn't send it to us.
+    CHECK_EQ(0, real_pid);
+  }
+
+  return true;
+}
+
 }  // namespace content