Fixed perf regression by removing tree traversal for text sibling.

third_party/WebKit/Source/core/dom/Element.h

Index: third_party/WebKit/Source/core/dom/Element.h
diff --git a/third_party/WebKit/Source/core/dom/Element.h b/third_party/WebKit/Source/core/dom/Element.h
index 6cb006f74da67e53312a88f35ce4854924bdc768..f4abcd66c16eeda44881321fd9909f384d208ab1 100644
--- a/third_party/WebKit/Source/core/dom/Element.h
+++ b/third_party/WebKit/Source/core/dom/Element.h
@@ -397,7 +397,7 @@ class CORE_EXPORT Element : public ContainerNode {
 
   virtual LayoutObject* createLayoutObject(const ComputedStyle&);
   virtual bool layoutObjectIsNeeded(const ComputedStyle&);
-  void recalcStyle(StyleRecalcChange);
+  void recalcStyle(StyleRecalcChange, Text* nextTextSibling = nullptr);
   StyleRecalcChange rebuildLayoutTree();
   void pseudoStateChanged(CSSSelector::PseudoType);
   void setAnimationStyleChange(bool);
@@ -820,7 +820,7 @@ class CORE_EXPORT Element : public ContainerNode {
   // and returns the new style. Otherwise, returns null.
   PassRefPtr<ComputedStyle> propagateInheritedProperties(StyleRecalcChange);
 
-  StyleRecalcChange recalcOwnStyle(StyleRecalcChange);
+  StyleRecalcChange recalcOwnStyle(StyleRecalcChange, Text*);
   inline void checkForEmptyStyleChange();
 
   void updatePseudoElement(PseudoId, StyleRecalcChange);