Move and rename RenderPart to LayoutPart.

Source/core/rendering/RenderPartTest.cpp

-// Copyright 2014 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 "config.h"
-#include "core/rendering/RenderPart.h"
-
-#include "core/html/HTMLElement.h"
-#include "core/layout/ImageQualityController.h"
-#include "core/rendering/RenderingTestHelper.h"
-#include <gtest/gtest.h>
-
-namespace blink {
-
-class RenderPartTest : public RenderingTest {
-};
-
-TEST_F(RenderPartTest, DestroyUpdatesImageQualityController)
-{
-    RefPtrWillBeRawPtr<Element> element = HTMLElement::create(HTMLNames::divTag, document());
-    LayoutObject* part = new RenderPart(element.get());
-    // The third and forth arguments are not important in this test.
-    ImageQualityController::imageQualityController()->set(part, 0, this, LayoutSize(1, 1));
-    EXPECT_TRUE(ImageQualityController::has(part));
-    part->destroy();
-    EXPECT_FALSE(ImageQualityController::has(part));
-}
-
-}