DOM: Do not skip 'replace data' operation on setting identical string to CharacterData.

third_party/WebKit/Source/core/dom/CharacterData.cpp

Index: third_party/WebKit/Source/core/dom/CharacterData.cpp
diff --git a/third_party/WebKit/Source/core/dom/CharacterData.cpp b/third_party/WebKit/Source/core/dom/CharacterData.cpp
index 47bd7ca3f66fe169625864b769e1fe198805ce72..88c63a55623f10d35eb6127cc688b13cd9970b02 100644
--- a/third_party/WebKit/Source/core/dom/CharacterData.cpp
+++ b/third_party/WebKit/Source/core/dom/CharacterData.cpp
@@ -42,9 +42,6 @@ void CharacterData::atomize() {
 
 void CharacterData::setData(const String& data) {
   const String& nonNullData = !data.isNull() ? data : emptyString;
-  if (m_data == nonNullData)
-    return;
-
   unsigned oldLength = length();
 
   setDataAndUpdate(nonNullData, 0, oldLength, nonNullData.length(),