views: support dialog width snapping once and for all

ui/views/bubble/bubble_frame_view.cc

Index: ui/views/bubble/bubble_frame_view.cc
diff --git a/ui/views/bubble/bubble_frame_view.cc b/ui/views/bubble/bubble_frame_view.cc
index 1a3ae270416cac0148ae01932b13e8265a0d116b..2a15779b5543729fcd8f4cc993c380bb5905bf3e 100644
--- a/ui/views/bubble/bubble_frame_view.cc
+++ b/ui/views/bubble/bubble_frame_view.cc
@@ -36,6 +36,7 @@
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 #include "ui/views/window/client_view.h"
+#include "ui/views/window/dialog_delegate.h"
 
 namespace views {
 
@@ -532,6 +533,9 @@ gfx::Size BubbleFrameView::GetSizeForClientSize(
   if (footnote_container_)
     size.Enlarge(0, footnote_container_->GetHeightForWidth(size.width()));
 
+  if (GetWidget()->widget_delegate()->AsDialogDelegate())
+    size.set_width(LayoutProvider::Get()->GetSnappedDialogWidth(size.width()));
+
   return size;
 }