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

trunk/Source/core/css/resolver/ElementResolveContext.h

Index: trunk/Source/core/css/resolver/ElementResolveContext.h
===================================================================
--- trunk/Source/core/css/resolver/ElementResolveContext.h	(revision 190671)
+++ trunk/Source/core/css/resolver/ElementResolveContext.h	(working copy)
@@ -43,7 +43,7 @@
     Element* element() const { return m_element; }
     const ContainerNode* parentNode() const { return m_parentNode; }
     const LayoutStyle* rootElementStyle() const { return m_rootElementStyle; }
-    const LayoutStyle* parentStyle() const { return parentNode() ? parentNode()->layoutStyle() : nullptr; }
+    LayoutStyle* parentStyle() const { return parentNode() ? parentNode()->layoutStyle() : nullptr; }
     EInsideLink elementLinkState() const { return m_elementLinkState; }
     bool distributedToInsertionPoint() const { return m_distributedToInsertionPoint; }
 
@@ -50,7 +50,7 @@
 private:
     RawPtrWillBeMember<Element> m_element;
     RawPtrWillBeMember<ContainerNode> m_parentNode;
-    const LayoutStyle* m_rootElementStyle;
+    LayoutStyle* m_rootElementStyle;
     EInsideLink m_elementLinkState;
     bool m_distributedToInsertionPoint;
 };