Adding method to create process using LowBox token in sandbox code.

sandbox/win/src/app_container.cc

Index: sandbox/win/src/app_container.cc
diff --git a/sandbox/win/src/app_container.cc b/sandbox/win/src/app_container.cc
index f8d754191592341cd2e37390c5f91cc8501713a8..1737d908f9c571a6ba259892a43bae6733ccbe63 100644
--- a/sandbox/win/src/app_container.cc
+++ b/sandbox/win/src/app_container.cc
@@ -74,26 +74,14 @@ ResultCode AppContainerAttributes::SetAppContainer(
   return SBOX_ALL_OK;
 }
 
-ResultCode AppContainerAttributes::ShareForStartup(
-      base::win::StartupInformation* startup_information) const {
-  // The only thing we support so far is an AppContainer.
-  if (!capabilities_.AppContainerSid)
-    return SBOX_ERROR_INVALID_APP_CONTAINER;
-
-  if (!startup_information->UpdateProcThreadAttribute(
-           PROC_THREAD_ATTRIBUTE_SECURITY_CAPABILITIES,
-           const_cast<SECURITY_CAPABILITIES*>(&capabilities_),
-           sizeof(capabilities_)))  {
-    DPLOG(ERROR) << "Failed UpdateProcThreadAttribute";
-    return SBOX_ERROR_CANNOT_INIT_APPCONTAINER;
-  }
-  return SBOX_ALL_OK;
-}
-
 bool AppContainerAttributes::HasAppContainer() const {
   return (capabilities_.AppContainerSid != NULL);
 }
 
+const SECURITY_CAPABILITIES& AppContainerAttributes::GetCapabilities() const {
+  return capabilities_;
+}
+
 ResultCode CreateAppContainer(const base::string16& sid,
                               const base::string16& name) {
   PSID local_sid;