Have EditCommand classes deal with Document references, not pointers

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 8cdcf9ce48048b757b4cc9f2fa5a7e3d00aa8a93..3867577310b54410afe7c7a08fddd1aadfb6f229 100644
--- a/Source/core/editing/FormatBlockCommand.cpp
+++ b/Source/core/editing/FormatBlockCommand.cpp
@@ -44,7 +44,7 @@ static inline bool isElementForFormatBlock(Node* node)
     return node->isElementNode() && isElementForFormatBlock(toElement(node)->tagQName());
 }
 
-FormatBlockCommand::FormatBlockCommand(Document* document, const QualifiedName& tagName)
+FormatBlockCommand::FormatBlockCommand(Document& document, const QualifiedName& tagName)
     : ApplyBlockElementCommand(document, tagName)
     , m_didApply(false)
 {
@@ -64,7 +64,7 @@ void FormatBlockCommand::formatRange(const Position& start, const Position& end,
     RefPtr<Node> outerBlock = (start.deprecatedNode() == nodeToSplitTo) ? start.deprecatedNode() : splitTreeToNode(start.deprecatedNode(), nodeToSplitTo);
     RefPtr<Node> nodeAfterInsertionPosition = outerBlock;
 
-    RefPtr<Range> range = Range::create(document(), start, endOfSelection);
+    RefPtr<Range> range = Range::create(&document(), start, endOfSelection);
     Element* refNode = enclosingBlockFlowElement(end);
     Element* root = editableRootForPosition(start);
     // Root is null for elements with contenteditable=false.