Minimize RenderObject* casting to RenderText*

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 145 matching lines @@
 static inline void appendContextSubtargetsForNode(Node* node, SubtargetGeometryList& subtargets)
 {
     // This is a variant of appendBasicSubtargetsForNode that adds special subtargets for
     // selected or auto-selectable parts of text nodes.
     ASSERT(node->renderer());
 
     if (!node->isTextNode())
         return appendBasicSubtargetsForNode(node, subtargets);
 
     Text* textNode = toText(node);
-    RenderText* textRenderer = toRenderText(textNode->renderer());
+    RenderText* textRenderer = textNode->renderer();
 
     if (textRenderer->frame()->editor().behavior().shouldSelectOnContextualMenuClick()) {
         // Make subtargets out of every word.
         String textValue = textNode->data();
         TextBreakIterator* wordIterator = wordBreakIterator(textValue, 0, textValue.length());
         int lastOffset = wordIterator->first();
         if (lastOffset == -1)
             return;
         int offset;
         while ((offset = wordIterator->next()) != -1) {
@@ skipping 327 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