Make first-letter style to work with editing

Source/core/editing/TextIterator.cpp

Index: Source/core/editing/TextIterator.cpp
diff --git a/Source/core/editing/TextIterator.cpp b/Source/core/editing/TextIterator.cpp
index d11344ea24f8483bfb5f58372bd99f4eacacb319..9ede8e65c52b5ff31d7c5c62926d17eca413ac15 100644
--- a/Source/core/editing/TextIterator.cpp
+++ b/Source/core/editing/TextIterator.cpp
@@ -620,26 +620,13 @@ void TextIterator::handleTextBox()
     }
 }
 
-static inline RenderText* firstRenderTextInFirstLetter(RenderObject* firstLetter)
-{
-    if (!firstLetter)
-        return 0;
-
-    // FIXME: Should this check descendent objects?
-    for (RenderObject* current = firstLetter->firstChild(); current; current = current->nextSibling()) {
-        if (current->isText())
-            return toRenderText(current);
-    }
-    return 0;
-}
-
 void TextIterator::handleTextNodeFirstLetter(RenderTextFragment* renderer)
 {
     if (renderer->firstLetter()) {
         RenderObject* r = renderer->firstLetter();
         if (r->style()->visibility() != VISIBLE && !m_ignoresStyleVisibility)
             return;
-        if (RenderText* firstLetter = firstRenderTextInFirstLetter(r)) {
+        if (RenderText* firstLetter = renderer->firstRenderTextInFirstLetter()) {
             m_handledFirstLetter = true;
             m_remainingTextBox = m_textBox;
             m_textBox = firstLetter->firstTextBox();
@@ -1289,7 +1276,7 @@ RenderText* SimplifiedBackwardsTextIterator::handleFirstLetter(int& startOffset,
 
     m_shouldHandleFirstLetter = false;
     offsetInNode = 0;
-    return firstRenderTextInFirstLetter(fragment->firstLetter());
+    return fragment->firstRenderTextInFirstLetter();
 }
 
 bool SimplifiedBackwardsTextIterator::handleReplacedElement()