Make first-letter style to work with editing

Source/core/editing/CompositeEditCommand.cpp

Index: Source/core/editing/CompositeEditCommand.cpp
diff --git a/Source/core/editing/CompositeEditCommand.cpp b/Source/core/editing/CompositeEditCommand.cpp
index 7485702169b85d935060ef09361dbc144ac548cd..79d0d6e9e9dbe0388d3e154163a65b3029ee3ea9 100644
--- a/Source/core/editing/CompositeEditCommand.cpp
+++ b/Source/core/editing/CompositeEditCommand.cpp
@@ -846,7 +846,7 @@ PassRefPtr<Node> CompositeEditCommand::insertBlockPlaceholder(const Position& po
         return 0;
 
     // Should assert isBlockFlow || isInlineFlow when deletion improves.  See 4244964.
-    ASSERT(pos.deprecatedNode()->renderer());
+    ASSERT(pos.renderer());
 
     RefPtr<Node> placeholder = createBlockPlaceholderElement(document());
     insertNodeAt(placeholder, pos);
@@ -927,7 +927,7 @@ PassRefPtr<Node> CompositeEditCommand::moveParagraphContentsToNewBlockIfNecessar
         if (upstreamStart.deprecatedNode() == editableRootForPosition(upstreamStart)) {
             // If the block is the root editable element and it contains no visible content, create a new
             // block but don't try and move content into it, since there's nothing for moveParagraphs to move.
-            if (!Position::hasRenderedNonAnonymousDescendantsWithHeight(upstreamStart.deprecatedNode()->renderer()))
+            if (!Position::hasRenderedNonAnonymousDescendantsWithHeight(upstreamStart.renderer()))
                 return insertNewDefaultParagraphElementAt(upstreamStart);
         } else if (isBlock(upstreamEnd.deprecatedNode())) {
             if (!upstreamEnd.deprecatedNode()->isDescendantOf(upstreamStart.deprecatedNode())) {
@@ -1360,7 +1360,7 @@ bool CompositeEditCommand::breakOutOfEmptyMailBlockquotedParagraph()
 
     Position caretPos(caret.deepEquivalent().downstream());
     // A line break is either a br or a preserved newline.
-    ASSERT(caretPos.deprecatedNode()->hasTagName(brTag) || (caretPos.deprecatedNode()->isTextNode() && caretPos.deprecatedNode()->renderer()->style()->preserveNewline()));
+    ASSERT(caretPos.deprecatedNode()->hasTagName(brTag) || (caretPos.deprecatedNode()->isTextNode() && caretPos.renderer()->style()->preserveNewline()));
 
     if (caretPos.deprecatedNode()->hasTagName(brTag))
         removeNodeAndPruneAncestors(caretPos.deprecatedNode());