Make RenderObject::style() return a const object

Source/core/page/TouchAdjustment.cpp

 /*
  * Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 76 matching lines @@
         Element* element = toElement(node);
         // Tapping on a text field or other focusable item should trigger adjustment, except
         // that iframe elements are hard-coded to support focus but the effect is often invisible
         // so they should be excluded.
         if (element->isMouseFocusable() && !isHTMLIFrameElement(element))
             return true;
         // Accept nodes that has a CSS effect when touched.
         if (element->childrenOrSiblingsAffectedByActive() || element->childrenOrSiblingsAffectedByHover())
             return true;
     }
-    if (LayoutStyle* layoutStyle = node->layoutStyle()) {
+    if (const LayoutStyle* layoutStyle = node->layoutStyle()) {
         if (layoutStyle->affectedByActive() || layoutStyle->affectedByHover())
             return true;
     }
     return false;
 }
 
 bool nodeIsZoomTarget(Node* node)
 {
     if (node->isTextNode() || node->isShadowRoot())
         return false;
@@ skipping 399 matching lines @@
 
 bool findBestZoomableArea(Node*& targetNode, IntRect& targetArea, const IntPoint& touchHotspot, const IntRect& touchArea, const WillBeHeapVector<RefPtrWillBeMember<Node>>& nodes)
 {
     IntPoint targetPoint;
     TouchAdjustment::SubtargetGeometryList subtargets;
     TouchAdjustment::compileZoomableSubtargets(nodes, subtargets);
     return TouchAdjustment::findNodeWithLowestDistanceMetric(targetNode, targetPoint, targetArea, touchHotspot, touchArea, subtargets, TouchAdjustment::zoomableIntersectionQuotient);
 }
 
 } // namespace blink