touch ui: Do not hide text selection handles when screen is rotated.

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 059709030799446c35d54c78b73330da7e71bab3..0846f6a0c50cf6b2a162e325248ffcb0c5dc74f1 100644
--- a/ui/views/touchui/touch_selection_controller_impl.cc
+++ b/ui/views/touchui/touch_selection_controller_impl.cc
@@ -446,7 +446,6 @@ TouchSelectionControllerImpl::TouchSelectionControllerImpl(
       dragging_handle_(nullptr) {
   selection_start_time_ = base::TimeTicks::Now();
   aura::Window* client_window = client_view_->GetNativeView();
-  client_window->AddObserver(this);
   client_widget_ = Widget::GetTopLevelWidgetForNativeView(client_window);
   if (client_widget_)
     client_widget_->AddObserver(this);
@@ -460,7 +459,6 @@ TouchSelectionControllerImpl::~TouchSelectionControllerImpl() {
   aura::Env::GetInstance()->RemovePreTargetHandler(this);
   if (client_widget_)
     client_widget_->RemoveObserver(this);
-  client_view_->GetNativeView()->RemoveObserver(this);
 }
 
 void TouchSelectionControllerImpl::SelectionChanged() {
@@ -643,12 +641,6 @@ void TouchSelectionControllerImpl::RunContextMenu() {
   client_view_->OpenContextMenu(anchor);
 }
 
-void TouchSelectionControllerImpl::OnAncestorWindowTransformed(
-    aura::Window* window,
-    aura::Window* ancestor) {
-  client_view_->DestroyTouchSelection();
-}
-
 void TouchSelectionControllerImpl::OnWidgetClosing(Widget* widget) {
   DCHECK_EQ(client_widget_, widget);
   client_widget_->RemoveObserver(this);