Inline Isolate::UncheckedCurrent into isolate.cc

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 6a20c3e916633af6dca677d5cb22907da205ffa9..bc564979df98585660a30034c062e6b5ecdbbd46 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -481,14 +481,9 @@ class Isolate {
     return isolate;
   }
 
-  INLINE(static Isolate* UncheckedCurrent()) {
-    DCHECK(base::NoBarrier_Load(&isolate_key_created_) == 1);
-    return reinterpret_cast<Isolate*>(
-        base::Thread::GetThreadLocal(isolate_key_));
-  }
-
-  // Like UncheckedCurrent, but skips the check that |isolate_key_| was
-  // initialized. Callers have to ensure that themselves.
+  // Like Current, but skips the check that |isolate_key_| was initialized.
+  // Callers have to ensure that themselves.
+  // DO NOT USE. The only remaining callsite will be deleted soon.
   INLINE(static Isolate* UnsafeCurrent()) {
     return reinterpret_cast<Isolate*>(
         base::Thread::GetThreadLocal(isolate_key_));