Fix sandbox::PolicyBase leak

sandbox/win/tests/common/controller.cc

Index: sandbox/win/tests/common/controller.cc
diff --git a/sandbox/win/tests/common/controller.cc b/sandbox/win/tests/common/controller.cc
index 9f57137c0e7d31844d75addb1590bd7080f6c476..2067d2d9e01958ca48543448c40fb52e0322dca1 100644
--- a/sandbox/win/tests/common/controller.cc
+++ b/sandbox/win/tests/common/controller.cc
@@ -136,15 +136,12 @@ void TestRunner::Init(JobLevel job_level,
 }
 
 TargetPolicy* TestRunner::GetPolicy() {
-  return policy_;
+  return policy_.get();
 }
 
 TestRunner::~TestRunner() {
   if (target_process_.IsValid() && kill_on_destruction_)
     ::TerminateProcess(target_process_.Get(), 0);
-
-  if (policy_)
-    policy_->Release();
 }
 
 bool TestRunner::AddRule(TargetPolicy::SubSystem subsystem,