Revert of Remove ClearSelection() from Layout{BlockFlow,Inline}::WillbeDestroyed()

third_party/WebKit/Source/core/layout/LayoutInline.cpp

Index: third_party/WebKit/Source/core/layout/LayoutInline.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutInline.cpp b/third_party/WebKit/Source/core/layout/LayoutInline.cpp
index e001e747cceb74256b483631e590d1d8dce3a8ba..e8ae8c9767e4fcddadd6b8235676787b81471078 100644
--- a/third_party/WebKit/Source/core/layout/LayoutInline.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutInline.cpp
@@ -76,6 +76,13 @@
 
   if (!DocumentBeingDestroyed()) {
     if (FirstLineBox()) {
+      // We can't wait for LayoutBoxModelObject::destroy to clear the selection,
+      // because by then we will have nuked the line boxes.
+      // FIXME: The FrameSelection should be responsible for this when it
+      // is notified of DOM mutations.
+      if (IsSelectionBorder())
+        View()->ClearSelection();
+
       // If line boxes are contained inside a root, that means we're an inline.
       // In that case, we need to remove all the line boxes so that the parent
       // lines aren't pointing to deleted children. If the first line box does