[Editing][Regression] Contenteditable w/ "-webkit-user-select:all" should be editable.

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

Index: third_party/WebKit/Source/core/editing/SelectionController.cpp
diff --git a/third_party/WebKit/Source/core/editing/SelectionController.cpp b/third_party/WebKit/Source/core/editing/SelectionController.cpp
index f29f07d1bc2c743d1ddc37fee0f46193249f96d1..c6fe984eca1f870dd37f2da56752814a80b9da01 100644
--- a/third_party/WebKit/Source/core/editing/SelectionController.cpp
+++ b/third_party/WebKit/Source/core/editing/SelectionController.cpp
@@ -87,6 +87,10 @@ VisibleSelectionInFlatTree expandSelectionToRespectUserSelectAll(Node* targetNod
     Node* rootUserSelectAll = EditingInFlatTreeStrategy::rootUserSelectAllForNode(targetNode);
     if (!rootUserSelectAll)
         return selection;
+    if (rootUserSelectAll->isHTMLElement() && toHTMLElement(rootUserSelectAll)->isTextFormControl())
+        return selection;
+    if (rootUserSelectAll->layoutObject()->style()->userModify() != READ_ONLY)
+        return selection;
 
     VisibleSelectionInFlatTree newSelection(selection);
     newSelection.setBase(mostBackwardCaretPosition(PositionInFlatTree::beforeNode(rootUserSelectAll), CanCrossEditingBoundary));