Move and rename RenderPart to LayoutPart.

Source/core/layout/compositing/GraphicsLayerTreeBuilder.cpp

Index: Source/core/layout/compositing/GraphicsLayerTreeBuilder.cpp
diff --git a/Source/core/layout/compositing/GraphicsLayerTreeBuilder.cpp b/Source/core/layout/compositing/GraphicsLayerTreeBuilder.cpp
index 799fe4a8aa26311aa8b5f3a5e4f195823fa8ce73..50ff9cd1d3819216a28032f5fe0f5f1db4f8e719 100644
--- a/Source/core/layout/compositing/GraphicsLayerTreeBuilder.cpp
+++ b/Source/core/layout/compositing/GraphicsLayerTreeBuilder.cpp
@@ -31,9 +31,9 @@
 #include "core/html/HTMLVideoElement.h"
 #include "core/layout/Layer.h"
 #include "core/layout/LayerReflectionInfo.h"
+#include "core/layout/LayoutPart.h"
 #include "core/layout/compositing/CompositedLayerMapping.h"
 #include "core/layout/compositing/LayerCompositor.h"
-#include "core/rendering/RenderPart.h"
 #include "core/rendering/RenderView.h"
 
 namespace blink {
@@ -101,8 +101,8 @@ void GraphicsLayerTreeBuilder::rebuild(Layer& layer, AncestorInfo info)
 
     if (hasCompositedLayerMapping) {
         bool parented = false;
-        if (layer.renderer()->isRenderPart())
-            parented = LayerCompositor::parentFrameContentLayers(toRenderPart(layer.renderer()));
+        if (layer.renderer()->isLayoutPart())
+            parented = LayerCompositor::parentFrameContentLayers(toLayoutPart(layer.renderer()));
 
         if (!parented)
             currentCompositedLayerMapping->parentForSublayers()->setChildren(layerChildren);