Drop UniqueId from include/v8.h

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 137 matching lines @@
 class Isolate;
 class Object;
 struct StreamedSource;
 template<typename T> class CustomArguments;
 class PropertyCallbackArguments;
 class FunctionCallbackArguments;
 class GlobalHandles;
 }  // namespace internal
 
 
-/**
- * General purpose unique identifier.
- */
-class UniqueId {
- public:
-  explicit UniqueId(intptr_t data)
-      : data_(data) {}
-
-  bool operator==(const UniqueId& other) const {
-    return data_ == other.data_;
-  }
-
-  bool operator!=(const UniqueId& other) const {
-    return data_ != other.data_;
-  }
-
-  bool operator<(const UniqueId& other) const {
-    return data_ < other.data_;
-  }
-
- private:
-  intptr_t data_;
-};
-
 // --- Handles ---
 
 #define TYPE_CHECK(T, S)                                       \
   while (false) {                                              \
     *(static_cast<T* volatile*>(0)) = static_cast<S*>(0);      \
   }
 
 
 /**
  * An object reference managed by the v8 garbage collector.
@@ skipping 9642 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_