Provide a separate app bundle for subprocesses like the renderer on the Mac....

chrome/browser/utility_process_host.cc

Index: chrome/browser/utility_process_host.cc
===================================================================
--- chrome/browser/utility_process_host.cc	(revision 22918)
+++ chrome/browser/utility_process_host.cc	(working copy)
@@ -52,12 +52,7 @@
 }
 
 std::wstring UtilityProcessHost::GetUtilityProcessCmd() {
-  std::wstring exe_path = CommandLine::ForCurrentProcess()->GetSwitchValue(
-      switches::kBrowserSubprocessPath);
-  if (exe_path.empty()) {
-    PathService::Get(base::FILE_EXE, &exe_path);
-  }
-  return exe_path;
+  return GetChildPath();
 }
 
 bool UtilityProcessHost::StartProcess(const FilePath& exposed_dir) {