[Editing][CSS] Drag from a -webkit-user-select:none element should not start selection

third_party/WebKit/Source/core/dom/Node.cpp

Index: third_party/WebKit/Source/core/dom/Node.cpp
diff --git a/third_party/WebKit/Source/core/dom/Node.cpp b/third_party/WebKit/Source/core/dom/Node.cpp
index b6a7a56d31ed645f6b99c6b0f2a1318f155af947..0f3aba21711281ff91244caa1b85821f4d50c18a 100644
--- a/third_party/WebKit/Source/core/dom/Node.cpp
+++ b/third_party/WebKit/Source/core/dom/Node.cpp
@@ -973,9 +973,10 @@ bool Node::canStartSelection() const
 
     if (layoutObject()) {
         const ComputedStyle& style = layoutObject()->styleRef();
-        // We allow selections to begin within an element that has -webkit-user-select: none set,
-        // but if the element is draggable then dragging should take priority over selection.
-        if (style.userDrag() == DRAG_ELEMENT && style.userSelect() == SELECT_NONE)
+        // We don't allow selections to begin within an element that has
+        // -webkit-user-select: none set,
+        // https://drafts.csswg.org/css-ui-4/#valdef-user-select-none
+        if (style.userSelect() == SELECT_NONE)
             return false;
     }
     ContainerNode* parent = FlatTreeTraversal::parent(*this);