Revert of Add WeakMap to v8.h

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index d1c476ac3240ca32a0d722e6c9c3f5bfda02efe2..e8ca3df18f28fd7219384d63e951f3607b6c7883 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -1533,31 +1533,6 @@
    * \return The corresponding value if successfully parsed.
    */
   static Local<Value> Parse(Local<String> json_string);
-};
-
-
-/**
- * A map whose keys are referenced weakly. It is similar to JavaScript WeakMap
- * but can be created without entering a v8::Context and hence shouldn't
- * escape to JavaScript.
- */
-class V8_EXPORT WeakMap {
- public:
-  static WeakMap* New(Isolate* isolate);
-  void Set(Handle<Value> key, Handle<Value> value);
-  Local<Value> Get(Handle<Value> key);
-  bool Has(Handle<Value> key);
-  bool Delete(Handle<Value> key);
-
- private:
-  WeakMap(Isolate* isolate, Handle<Object> weak_map)
-      : isolate_(isolate), map_(isolate, weak_map) {}
-  Isolate* isolate_;
-  UniquePersistent<Object> map_;
-
-  // Disallow copying and assigning.
-  WeakMap(WeakMap&);
-  void operator=(WeakMap&);
 };