Revert 156550 - Add sandbox support for Windows process mitigations

sandbox/win/src/broker_services.cc

Index: sandbox/win/src/broker_services.cc
===================================================================
--- sandbox/win/src/broker_services.cc	(revision 156553)
+++ sandbox/win/src/broker_services.cc	(working copy)
@@ -12,7 +12,6 @@
 #include "base/win/startup_information.h"
 #include "base/win/windows_version.h"
 #include "sandbox/win/src/app_container.h"
-#include "sandbox/win/src/process_mitigations.h"
 #include "sandbox/win/src/sandbox_policy_base.h"
 #include "sandbox/win/src/sandbox.h"
 #include "sandbox/win/src/target_process.h"
@@ -321,36 +320,12 @@
         const_cast<wchar_t*>(desktop.c_str());
   }
 
-  if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
-    int attribute_count = 0;
-    const AppContainerAttributes* app_container =
-        policy_base->GetAppContainer();
-    if (app_container)
-      ++attribute_count;
-
-    DWORD64 mitigations;
-    size_t mitigations_size;
-    ConvertProcessMitigationsToPolicy(policy->GetProcessMitigations(),
-                                      &mitigations, &mitigations_size);
-    if (mitigations)
-      ++attribute_count;
-
-    if (!startup_info.InitializeProcThreadAttributeList(attribute_count))
-      return SBOX_ERROR_PROC_THREAD_ATTRIBUTES;
-
-    if (app_container) {
-      result = app_container->ShareForStartup(&startup_info);
-      if (SBOX_ALL_OK != result)
-        return result;
-    }
-
-    if (mitigations) {
-      if (!startup_info.UpdateProcThreadAttribute(
-               PROC_THREAD_ATTRIBUTE_MITIGATION_POLICY, &mitigations,
-               mitigations_size)) {
-        return SBOX_ERROR_PROC_THREAD_ATTRIBUTES;
-      }
-    }
+  const AppContainerAttributes* app_container = policy_base->GetAppContainer();
+  if (app_container) {
+    startup_info.InitializeProcThreadAttributeList(1);
+    result = app_container->ShareForStartup(&startup_info);
+    if (SBOX_ALL_OK != result)
+      return result;
   }
 
   // Construct the thread pool here in case it is expensive.