Make first-letter style to work with editing

Source/core/editing/InsertParagraphSeparatorCommand.cpp

Index: Source/core/editing/InsertParagraphSeparatorCommand.cpp
diff --git a/Source/core/editing/InsertParagraphSeparatorCommand.cpp b/Source/core/editing/InsertParagraphSeparatorCommand.cpp
index 84f830e69e159cc000f8163e8cdea30e2be0351b..4958bf559f6b932b58e92ec13c36ed673645210a 100644
--- a/Source/core/editing/InsertParagraphSeparatorCommand.cpp
+++ b/Source/core/editing/InsertParagraphSeparatorCommand.cpp
@@ -170,7 +170,7 @@ void InsertParagraphSeparatorCommand::doApply()
         || isTableCell(startBlock.get())
         || startBlock->hasTagName(formTag)
         // FIXME: If the node is hidden, we don't have a canonical position so we will do the wrong thing for tables and <hr>. https://bugs.webkit.org/show_bug.cgi?id=40342
-        || (!canonicalPos.isNull() && canonicalPos.deprecatedNode()->renderer() && canonicalPos.deprecatedNode()->renderer()->isTable())
+        || (!canonicalPos.isNull() && canonicalPos.renderer() && canonicalPos.renderer()->isTable())
         || (!canonicalPos.isNull() && canonicalPos.deprecatedNode()->hasTagName(hrTag))) {
         applyCommandToComposite(InsertLineBreakCommand::create(document()));
         return;