Move wtf_unittests to platform/wtf/.

third_party/WebKit/Source/wtf/PassRefPtrTest.cpp

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "wtf/PassRefPtr.h"
-
-#include "testing/gtest/include/gtest/gtest.h"
-#include "wtf/RefCounted.h"
-
-namespace WTF {
-
-class RefCountedClass : public RefCounted<RefCountedClass> {};
-
-TEST(PassRefPtrTest, MoveConstructor) {
-  PassRefPtr<RefCountedClass> oldPassRefPtr = adoptRef(new RefCountedClass());
-  RefCountedClass* rawPtr = oldPassRefPtr.get();
-  EXPECT_EQ(rawPtr->refCount(), 1);
-  PassRefPtr<RefCountedClass> newPassRefPtr(std::move(oldPassRefPtr));
-  EXPECT_EQ(oldPassRefPtr.get(), nullptr);
-  EXPECT_EQ(newPassRefPtr.get(), rawPtr);
-  EXPECT_EQ(rawPtr->refCount(), 1);
-}
-
-}  // namespace WTF