Revert of Make SandboxIPCProcess a thread.

content/browser/renderer_host/render_sandbox_host_linux.h

Index: content/browser/renderer_host/render_sandbox_host_linux.h
diff --git a/content/browser/renderer_host/render_sandbox_host_linux.h b/content/browser/renderer_host/render_sandbox_host_linux.h
index 6c88dcc6a90cc632a165dd82cff4d040f7a8a331..2c5df388bd29f84540d179947420c4ca22158efc 100644
--- a/content/browser/renderer_host/render_sandbox_host_linux.h
+++ b/content/browser/renderer_host/render_sandbox_host_linux.h
@@ -8,9 +8,6 @@
 #include <string>
 
 #include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/threading/simple_thread.h"
-#include "content/browser/renderer_host/sandbox_ipc_linux.h"
 #include "content/common/content_export.h"
 
 template <typename T> struct DefaultSingletonTraits;
@@ -30,6 +27,10 @@
     DCHECK(initialized_);
     return renderer_socket_;
   }
+  pid_t pid() const {
+    DCHECK(initialized_);
+    return pid_;
+  }
   void Init(const std::string& sandbox_path);
 
  private:
@@ -42,9 +43,8 @@
   bool initialized_;
 
   int renderer_socket_;
-
-  scoped_ptr<SandboxIPCHandler> ipc_handler_;
-  scoped_ptr<base::DelegateSimpleThread> ipc_thread_;
+  int childs_lifeline_fd_;
+  pid_t pid_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderSandboxHostLinux);
 };