Move the Linux zygote stuff into its own per-process directory.

content/public/common/sandbox_linux.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_PUBLIC_COMMON_SANDBOX_LINUX_H_
+#define CONTENT_PUBLIC_COMMON_SANDBOX_LINUX_H_
+
+namespace content {
+
+// These form a bitmask which describes the conditions of the Linux sandbox.
+enum {
+  // SUID sandbox active.
+  kSandboxLinuxSUID = 1 << 0,
+
+  // SUID sandbox is using the PID namespace.
+  kSandboxLinuxPIDNS = 1 << 1,
+
+  //SUID sandbox is using the network namespace.
+  kSandboxLinuxNetNS = 1 << 2,
+
+  // seccomp sandbox active.
+  kSandboxLinuxSeccomp = 1 << 3
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_COMMON_SANDBOX_LINUX_H_