Hide virtual keyboard before removing it from view hierarchy.

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index 78b101441c362e1800a1565b99474d7a32501ee9..a008960f4a8b9c620c29b5bd1c1b85134933acea 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -677,10 +677,11 @@ void RootWindowController::DeactivateKeyboard(
     aura::Window* parent =
         GetContainer(kShellWindowId_ImeWindowParentContainer);
     DCHECK(parent);
+    // Virtual keyboard may be deactivated while still showing, hide the
+    // keyboard before removing it from view hierarchy.
+    keyboard_controller->HideKeyboard(
+        keyboard::KeyboardController::HIDE_REASON_AUTOMATIC);
     parent->RemoveChild(keyboard_container);
-    // Virtual keyboard may be deactivated while still showing, notify all
-    // observers that keyboard bounds changed to 0 before remove them.
-    keyboard_controller->NotifyKeyboardBoundsChanging(gfx::Rect());
     keyboard_controller->RemoveObserver(wm_shelf_->shelf_layout_manager());
     keyboard_controller->RemoveObserver(panel_layout_manager());
     keyboard_controller->RemoveObserver(docked_window_layout_manager());