Inline Isolate::UncheckedCurrent into isolate.cc

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 5bb2311efbec26b5fbb56df8a750aca90d1844f7..8521017eaf07206827ac10cca200b211e57915d4 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1847,7 +1847,9 @@ void Isolate::TearDown() {
   // direct pointer. We don't use Enter/Exit here to avoid
   // initializing the thread data.
   PerIsolateThreadData* saved_data = CurrentPerIsolateThreadData();
-  Isolate* saved_isolate = UncheckedCurrent();
+  DCHECK(base::NoBarrier_Load(&isolate_key_created_) == 1);
+  Isolate* saved_isolate =
+      reinterpret_cast<Isolate*>(base::Thread::GetThreadLocal(isolate_key_));
   SetIsolateThreadLocals(this, NULL);
 
   Deinit();