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 ba2fd82cb0395d9d890ffe824fec400cf3f59792..65d3aea6f75efbdbe305968cd1e7133c9f5976b1 100644
--- a/third_party/WebKit/Source/core/dom/Element.h
+++ b/third_party/WebKit/Source/core/dom/Element.h
@@ -399,7 +399,7 @@ 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);
@@ -822,7 +822,7 @@ 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);