Drop UniqueId from include/v8.h

test/cctest/test-global-handles.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 16 matching lines @@
 
 #include "src/api.h"
 #include "src/factory.h"
 #include "src/global-handles.h"
 #include "src/isolate.h"
 #include "src/objects-inl.h"
 #include "src/objects.h"
 #include "test/cctest/cctest.h"
 
 using namespace v8::internal;
-using v8::UniqueId;
 
 TEST(EternalHandles) {
   CcTest::InitializeVM();
   Isolate* isolate = CcTest::i_isolate();
   v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
   EternalHandles* eternal_handles = isolate->eternal_handles();
 
   // Create a number of handles that will not be on a block boundary
   const int kArrayLength = 2048-1;
   int indices[kArrayLength];
@@ skipping 129 matching lines @@
     g1.SetWeak();
     g2.Reset(isolate, v8::Object::New(isolate));
     g2.SetWeak();
   }
 
   CHECK_EQ(0u, isolate->NumberOfPhantomHandleResetsSinceLastCall());
   CcTest::CollectAllAvailableGarbage();
   CHECK_EQ(2u, isolate->NumberOfPhantomHandleResetsSinceLastCall());
   CHECK_EQ(0u, isolate->NumberOfPhantomHandleResetsSinceLastCall());
 }