Use tighter typing in editing: CompositeEditCommand

Source/core/editing/CompositeEditCommand.h

Index: Source/core/editing/CompositeEditCommand.h
diff --git a/Source/core/editing/CompositeEditCommand.h b/Source/core/editing/CompositeEditCommand.h
index e2c280cedd8526e7ed846da5e93bb04aa616d518..4dc807baf33c24b7cea52414be289cdf9aa77ce5 100644
--- a/Source/core/editing/CompositeEditCommand.h
+++ b/Source/core/editing/CompositeEditCommand.h
@@ -35,6 +35,7 @@ namespace blink {
 
 class EditingStyle;
 class Element;
+class HTMLBRElement;
 class HTMLElement;
 class Text;
 
@@ -141,16 +142,16 @@ protected:
     void deleteInsignificantText(const Position& start, const Position& end);
     void deleteInsignificantTextDownstream(const Position&);
 
-    PassRefPtrWillBeRawPtr<Node> appendBlockPlaceholder(PassRefPtrWillBeRawPtr<Element>);
-    PassRefPtrWillBeRawPtr<Node> insertBlockPlaceholder(const Position&);
-    PassRefPtrWillBeRawPtr<Node> addBlockPlaceholderIfNeeded(Element*);
+    PassRefPtrWillBeRawPtr<HTMLBRElement> appendBlockPlaceholder(PassRefPtrWillBeRawPtr<Element>);
+    PassRefPtrWillBeRawPtr<HTMLBRElement> insertBlockPlaceholder(const Position&);
+    PassRefPtrWillBeRawPtr<HTMLBRElement> addBlockPlaceholderIfNeeded(Element*);
     void removePlaceholderAt(const Position&);
 
-    PassRefPtrWillBeRawPtr<Element> insertNewDefaultParagraphElementAt(const Position&);
+    PassRefPtrWillBeRawPtr<HTMLElement> insertNewDefaultParagraphElementAt(const Position&);
 
-    PassRefPtrWillBeRawPtr<Element> moveParagraphContentsToNewBlockIfNecessary(const Position&);
+    PassRefPtrWillBeRawPtr<HTMLElement> moveParagraphContentsToNewBlockIfNecessary(const Position&);
 
-    void pushAnchorElementDown(Node*);
+    void pushAnchorElementDown(Element*);
 
     // FIXME: preserveSelection and preserveStyle should be enums
     void moveParagraph(const VisiblePosition&, const VisiblePosition&, const VisiblePosition&, bool preserveSelection = false, bool preserveStyle = true, Node* constrainingAncestor = 0);