Make previousLinePosition() not to use dangling RootInlineBox

third_party/WebKit/Source/core/editing/VisibleUnits.cpp

Index: third_party/WebKit/Source/core/editing/VisibleUnits.cpp
diff --git a/third_party/WebKit/Source/core/editing/VisibleUnits.cpp b/third_party/WebKit/Source/core/editing/VisibleUnits.cpp
index dfcbf04dcadef935e8026b06e17c69129ef9b137..2be451434d14e7fb4c8cea298bd91f3f73434af8 100644
--- a/third_party/WebKit/Source/core/editing/VisibleUnits.cpp
+++ b/third_party/WebKit/Source/core/editing/VisibleUnits.cpp
@@ -1326,7 +1326,7 @@ VisiblePosition previousLinePosition(const VisiblePosition& visiblePosition, Lay
     if (root) {
         // FIXME: Can be wrong for multi-column layout and with transforms.
         LayoutPoint pointInLine = absoluteLineDirectionPointToLocalPointInBlock(root, lineDirectionPoint);
-        LineLayoutItem lineLayoutItem = root->closestLeafChildForPoint(pointInLine, isEditablePosition(p))->getLineLayoutItem();
+        LineLayoutItem lineLayoutItem = root->closestLeafChildForPoint(pointInLine, isEditablePosition(p, ContentIsEditable, DoNotUpdateStyle))->getLineLayoutItem();
         Node* node = lineLayoutItem.node();
         if (node && editingIgnoresContent(node))
             return VisiblePosition::inParentBeforeNode(*node);