Have EditCommand classes deal with Document references, not pointers

Source/core/page/DragController.cpp

 /*
  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 489 matching lines @@
             bool smartDelete = innerFrame->editor().smartInsertDeleteEnabled();
             bool smartInsert = smartDelete && innerFrame->selection()->granularity() == WordGranularity && dragData->canSmartReplace();
             applyCommand(MoveSelectionCommand::create(fragment, dragCaret.base(), smartInsert, smartDelete));
         } else {
             if (setSelectionToDragCaret(innerFrame.get(), dragCaret, range, point)) {
                 ReplaceSelectionCommand::CommandOptions options = ReplaceSelectionCommand::SelectReplacement | ReplaceSelectionCommand::PreventNesting;
                 if (dragData->canSmartReplace())
                     options |= ReplaceSelectionCommand::SmartReplace;
                 if (chosePlainText)
                     options |= ReplaceSelectionCommand::MatchStyle;
-                applyCommand(ReplaceSelectionCommand::create(m_documentUnderMouse.get(), fragment, options));
+                ASSERT(m_documentUnderMouse);
+                applyCommand(ReplaceSelectionCommand::create(*m_documentUnderMouse.get(), fragment, options));
             }
         }
     } else {
         String text = dragData->asPlainText(innerFrame.get());
         if (text.isEmpty() || !innerFrame->editor().shouldInsertText(text, range.get(), EditorInsertActionDropped)) {
             return false;
         }
 
-        if (setSelectionToDragCaret(innerFrame.get(), dragCaret, range, point))
-            applyCommand(ReplaceSelectionCommand::create(m_documentUnderMouse.get(), createFragmentFromText(range.get(), text),  ReplaceSelectionCommand::SelectReplacement | ReplaceSelectionCommand::MatchStyle | ReplaceSelectionCommand::PreventNesting));
+        if (setSelectionToDragCaret(innerFrame.get(), dragCaret, range, point)) {
+            ASSERT(m_documentUnderMouse);
+            applyCommand(ReplaceSelectionCommand::create(*m_documentUnderMouse.get(), createFragmentFromText(range.get(), text),  ReplaceSelectionCommand::SelectReplacement | ReplaceSelectionCommand::MatchStyle | ReplaceSelectionCommand::PreventNesting));
+        }
     }
 
     if (rootEditableElement) {
         if (Frame* frame = rootEditableElement->document().frame())
             frame->eventHandler()->updateDragStateAfterEditDragIfNeeded(rootEditableElement.get());
     }
 
     return true;
 }
 
@@ skipping 391 matching lines @@
     return false;
 #endif
 }
 
 void DragController::cleanupAfterSystemDrag()
 {
 }
 
 } // namespace WebCore