Adds Window::MoveChildToFront, with surrounding changes.

views/widget/native_widget_views.cc

Index: views/widget/native_widget_views.cc
diff --git a/views/widget/native_widget_views.cc b/views/widget/native_widget_views.cc
index 3d1c263f792ee9d9cd8f3ce8d6ff5f569ac13c21..a7ab988a4677cd832067739adde1e51bd2880277 100644
--- a/views/widget/native_widget_views.cc
+++ b/views/widget/native_widget_views.cc
@@ -362,12 +362,6 @@ void NativeWidgetViews::SetSize(const gfx::Size& size) {
   view_->SetSize(size);
 }
 
-void NativeWidgetViews::SetBoundsConstrained(const gfx::Rect& bounds,
-                                             Widget* other_widget) {
-  // TODO(beng): honor other_widget.
-  SetBounds(bounds);
-}
-
 void NativeWidgetViews::MoveAbove(gfx::NativeView native_view) {
   NOTIMPLEMENTED();
 }