Revert 190605 "Make RenderObject::style() return a const object"

trunk/Source/core/dom/NodeLayoutStyle.h

Index: trunk/Source/core/dom/NodeLayoutStyle.h
===================================================================
--- trunk/Source/core/dom/NodeLayoutStyle.h	(revision 190671)
+++ trunk/Source/core/dom/NodeLayoutStyle.h	(working copy)
@@ -33,10 +33,10 @@
 
 namespace blink {
 
-inline LayoutStyle* Node::mutableLayoutStyle() const
+inline LayoutStyle* Node::layoutStyle() const
 {
     if (LayoutObject* renderer = this->renderer())
-        return renderer->mutableStyle();
+        return renderer->style();
     // <option> and <optgroup> can be styled even if they don't get renderers,
     // so they store their style internally and return it through nonRendererStyle().
     // We check here explicitly to avoid the virtual call in the common case.
@@ -45,13 +45,8 @@
     return 0;
 }
 
-inline const LayoutStyle* Node::layoutStyle() const
+inline LayoutStyle* Node::parentLayoutStyle() const
 {
-    return mutableLayoutStyle();
-}
-
-inline const LayoutStyle* Node::parentLayoutStyle() const
-{
     ContainerNode* parent = NodeRenderingTraversal::parent(*this);
     return parent ? parent->layoutStyle() : 0;
 }