Create a LinuxSandbox class

content/zygote/zygote_linux.h

Index: content/zygote/zygote_linux.h
diff --git a/content/zygote/zygote_linux.h b/content/zygote/zygote_linux.h
index 859bb3773f12c99a5e4f733d09086c8884f3eb5e..a093855d2672098f0629850cf33bc21a7c549d75 100644
--- a/content/zygote/zygote_linux.h
+++ b/content/zygote/zygote_linux.h
@@ -10,7 +10,6 @@
 
 #include "base/hash_tables.h"
 #include "base/process.h"
-#include "content/common/seccomp_sandbox.h"
 
 class Pickle;
 class PickleIterator;
@@ -24,12 +23,8 @@ class ZygoteForkDelegate;
 // runs it.
 class Zygote {
  public:
-  // The proc_fd_for_seccomp should be a file descriptor to /proc under the
-  // seccomp sandbox. This is not needed when not using seccomp, and should be
-  // -1 in those cases.
   Zygote(int sandbox_flags,
-         ZygoteForkDelegate* helper,
-         int proc_fd_for_seccomp);
+         ZygoteForkDelegate* helper);
   ~Zygote();
 
   bool ProcessRequests();
@@ -98,11 +93,6 @@ class Zygote {
   const int sandbox_flags_;
   ZygoteForkDelegate* helper_;
 
-#if defined(SECCOMP_SANDBOX)
-  // File descriptor to proc under seccomp, -1 when not using seccomp.
-  int proc_fd_for_seccomp_;
-#endif
-
   // These might be set by helper_->InitialUMA. They supply a UMA enumeration
   // sample we should report on the first fork.
   std::string initial_uma_name_;