Bug 1426733: Use restricting SIDs in Windows NPAPI process r=bobowen

Allow NPAPI sandbox to use restricting SIDs.

--HG--
extra : rebase_source : be53cfa3b05bd6d0f5b24b8f4f0b41e623d40e9a

security/sandbox/win/src/sandboxbroker/sandboxBroker.cpp

@@ -753,8 +753,6 @@ SandboxBroker::SetSecurityLevelForPluginProcess(int32_t aSandboxLevel)
     delayedIntegrityLevel = sandbox::INTEGRITY_LEVEL_MEDIUM;
   }
 
-  mPolicy->SetDoNotUseRestrictingSIDs();
-
   sandbox::ResultCode result = SetJobLevel(mPolicy, jobLevel,
                                            0 /* ui_exceptions */);
   SANDBOX_ENSURE_SUCCESS(result,