Use tighter typing in editing/

Source/core/editing/FormatBlockCommand.cpp

Index: Source/core/editing/FormatBlockCommand.cpp
diff --git a/Source/core/editing/FormatBlockCommand.cpp b/Source/core/editing/FormatBlockCommand.cpp
index 811ec75c7229e90b6208acf448235373e11686b2..9e2990e71beda7595f1c3fb7fa4874073540de42 100644
--- a/Source/core/editing/FormatBlockCommand.cpp
+++ b/Source/core/editing/FormatBlockCommand.cpp
@@ -59,7 +59,7 @@ void FormatBlockCommand::formatSelection(const VisiblePosition& startOfSelection
     m_didApply = true;
 }
 
-void FormatBlockCommand::formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtrWillBeRawPtr<Element>& blockNode)
+void FormatBlockCommand::formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtrWillBeRawPtr<HTMLElement>& blockNode)
 {
     Element* refNode = enclosingBlockFlowElement(VisiblePosition(end));
     Element* root = editableRootForPosition(start);