Revert 156550 - Add sandbox support for Windows process mitigations

content/app/startup_helper_win.cc

Index: content/app/startup_helper_win.cc
===================================================================
--- content/app/startup_helper_win.cc	(revision 156553)
+++ content/app/startup_helper_win.cc	(working copy)
@@ -10,7 +10,7 @@
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/win/windows_version.h"
-#include "sandbox/win/src/process_mitigations.h"
+#include "sandbox/win/src/dep.h"
 #include "sandbox/win/src/sandbox_factory.h"
 
 namespace {
@@ -37,13 +37,12 @@
 
 void InitializeSandboxInfo(sandbox::SandboxInterfaceInfo* info) {
   info->broker_services = sandbox::SandboxFactory::GetBrokerServices();
-  if (!info->broker_services) {
+  if (!info->broker_services)
     info->target_services = sandbox::SandboxFactory::GetTargetServices();
-  } else {
-    // Ensure the proper mitigations are enforced for the browser process.
-    sandbox::ApplyProcessMitigationsToCurrentProcess(
-        sandbox::MITIGATION_DEP |
-        sandbox::MITIGATION_DEP_NO_ATL_THUNK);
+
+  if (base::win::GetVersion() < base::win::VERSION_VISTA) {
+    // Enforces strong DEP support. Vista uses the NXCOMPAT flag in the exe.
+    sandbox::SetCurrentProcessDEP(sandbox::DEP_ENABLED);
   }
 }