Revert of Have Position deal with more references

Source/core/editing/BreakBlockquoteCommand.cpp

Index: Source/core/editing/BreakBlockquoteCommand.cpp
diff --git a/Source/core/editing/BreakBlockquoteCommand.cpp b/Source/core/editing/BreakBlockquoteCommand.cpp
index 9adb976aea6aa8de34a8632b06d96556a3d76c0e..0cb60d965281f014c5a46003c6f8f94aa001e88b 100644
--- a/Source/core/editing/BreakBlockquoteCommand.cpp
+++ b/Source/core/editing/BreakBlockquoteCommand.cpp
@@ -79,7 +79,7 @@
     // Instead, insert the break before the blockquote, unless the position is as the end of the the quoted content.
     if (isFirstVisiblePositionInNode(visiblePos, topBlockquote) && !isLastVisPosInNode) {
         insertNodeBefore(breakNode.get(), topBlockquote);
-        setEndingSelection(VisibleSelection(positionBeforeNode(*breakNode), DOWNSTREAM, endingSelection().isDirectional()));
+        setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.get()), DOWNSTREAM, endingSelection().isDirectional()));
         rebalanceWhitespace();
         return;
     }
@@ -89,7 +89,7 @@
 
     // If we're inserting the break at the end of the quoted content, we don't need to break the quote.
     if (isLastVisPosInNode) {
-        setEndingSelection(VisibleSelection(positionBeforeNode(*breakNode), DOWNSTREAM, endingSelection().isDirectional()));
+        setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.get()), DOWNSTREAM, endingSelection().isDirectional()));
         rebalanceWhitespace();
         return;
     }
@@ -182,7 +182,7 @@
     addBlockPlaceholderIfNeeded(clonedBlockquote.get());
 
     // Put the selection right before the break.
-    setEndingSelection(VisibleSelection(positionBeforeNode(*breakNode), DOWNSTREAM, endingSelection().isDirectional()));
+    setEndingSelection(VisibleSelection(positionBeforeNode(breakNode.get()), DOWNSTREAM, endingSelection().isDirectional()));
     rebalanceWhitespace();
 }