Implement the V2 sandbox in the process launcher.

content/browser/child_process_launcher_helper.h

Index: content/browser/child_process_launcher_helper.h
diff --git a/content/browser/child_process_launcher_helper.h b/content/browser/child_process_launcher_helper.h
index 8a48dbebaed49a4f4b7092a11d1994d3ba35eb0e..c68e0a52f8b497d33307f28651d34f7ca239c5bd 100644
--- a/content/browser/child_process_launcher_helper.h
+++ b/content/browser/child_process_launcher_helper.h
@@ -32,6 +32,10 @@
 #include "content/public/common/zygote_handle.h"
 #endif
 
+#if defined(OS_MACOSX)
+#include "sandbox/mac/seatbelt_exec.h"
+#endif
+
 namespace base {
 class CommandLine;
 }
@@ -198,6 +202,10 @@ class ChildProcessLauncherHelper :
   mojo::edk::ScopedPlatformHandle mojo_server_handle_;
   bool terminate_on_shutdown_;
 
+#if defined(OS_MACOSX)
+  std::unique_ptr<sandbox::SeatbeltExecClient> seatbelt_exec_client_;
+#endif  // defined(OS_MACOSX)
+
 #if defined(OS_ANDROID)
   base::android::ScopedJavaGlobalRef<jobject> java_peer_;
 #endif