[Win10 sandbox mitigations] Four new Win10 mitigations added.

sandbox/win/src/sandbox_policy_base.h

Index: sandbox/win/src/sandbox_policy_base.h
diff --git a/sandbox/win/src/sandbox_policy_base.h b/sandbox/win/src/sandbox_policy_base.h
index b2d1b7c853dea10ec207b0537d60fbc62e3b555d..6520915b866617c694aabe54d085e6e3ac15a24a 100644
--- a/sandbox/win/src/sandbox_policy_base.h
+++ b/sandbox/win/src/sandbox_policy_base.h
@@ -45,6 +45,7 @@ class PolicyBase final : public TargetPolicy {
   TokenLevel GetInitialTokenLevel() const override;
   TokenLevel GetLockdownTokenLevel() const override;
   ResultCode SetJobLevel(JobLevel job_level, uint32_t ui_exceptions) override;
+  JobLevel GetJobLevel() const override;
   ResultCode SetJobMemoryLimit(size_t memory_limit) override;
   ResultCode SetAlternateDesktop(bool alternate_winstation) override;
   base::string16 GetAlternateDesktop() const override;