WidgetDelegateView is its own contents view.

ui/views/touchui/touch_selection_controller_impl.cc

Index: ui/views/touchui/touch_selection_controller_impl.cc
diff --git a/ui/views/touchui/touch_selection_controller_impl.cc b/ui/views/touchui/touch_selection_controller_impl.cc
index 1e80313596406b892fb638a4e9fe3bc6713c5138..c4c5d26e93a425cd00f407e1a3189bb653d6716f 100644
--- a/ui/views/touchui/touch_selection_controller_impl.cc
+++ b/ui/views/touchui/touch_selection_controller_impl.cc
@@ -237,7 +237,6 @@ class TouchSelectionControllerImpl::EditingHandleView
         draw_invisible_(false),
         weak_ptr_factory_(this) {
     widget_.reset(CreateTouchSelectionPopupWidget(context, this));
-    widget_->SetContentsView(this);
 
     aura::Window* window = widget_->GetNativeWindow();
     window->SetEventTargeter(std::unique_ptr<ui::EventTargeter>(
@@ -321,6 +320,8 @@ class TouchSelectionControllerImpl::EditingHandleView
   }
 
   gfx::Size GetPreferredSize() const override {
+    if (selection_bound_.type() == gfx::SelectionBound::EMPTY)

[sky, 2016/10/06 16:49:20]

It would be nice if you had a comment as to why this is here to save me the time
of verifying it's necessary.

[Evan Stade, 2016/10/06 16:51:44]

Done.

+      return gfx::Size();
     return GetSelectionWidgetBounds(selection_bound_).size();
   }