Move and rename RenderPart to LayoutPart.

Source/core/layout/compositing/CompositingLayerAssigner.cpp

Index: Source/core/layout/compositing/CompositingLayerAssigner.cpp
diff --git a/Source/core/layout/compositing/CompositingLayerAssigner.cpp b/Source/core/layout/compositing/CompositingLayerAssigner.cpp
index 41f6ec04dd4da7e1b709d8ee99d5ee4d3a0e8f56..145a2ad17526d81b95e89a38228869509bef859b 100644
--- a/Source/core/layout/compositing/CompositingLayerAssigner.cpp
+++ b/Source/core/layout/compositing/CompositingLayerAssigner.cpp
@@ -130,8 +130,8 @@ CompositingReasons CompositingLayerAssigner::getReasonsPreventingSquashing(const
 
     // Don't squash iframes, frames or plugins.
     // FIXME: this is only necessary because there is frame code that assumes that composited frames are not squashed.
-    if (layer->renderer()->isRenderPart() || squashingLayer.renderer()->isRenderPart())
-        return CompositingReasonSquashingRenderPartIsDisallowed;
+    if (layer->renderer()->isLayoutPart() || squashingLayer.renderer()->isLayoutPart())
+        return CompositingReasonSquashingLayoutPartIsDisallowed;
 
     if (layer->reflectionInfo())
         return CompositingReasonSquashingReflectionIsDisallowed;