views: implement width snapping for DialogDelegateViews

ui/views/window/dialog_client_view_unittest.cc

Index: ui/views/window/dialog_client_view_unittest.cc
diff --git a/ui/views/window/dialog_client_view_unittest.cc b/ui/views/window/dialog_client_view_unittest.cc
index a8d3d8d79c222a876312009c96f65ee9328bfbb9..9bd976843f666cf24d1be038a7e6a9520cc5129f 100644
--- a/ui/views/window/dialog_client_view_unittest.cc
+++ b/ui/views/window/dialog_client_view_unittest.cc
@@ -44,7 +44,9 @@ class DialogClientViewTest : public test::WidgetTest,
   }
 
   // DialogDelegateView:
-  gfx::Size GetPreferredSize() const override { return preferred_size_; }
+  gfx::Size GetUnsnappedPreferredSize() const override {
+    return preferred_size_;
+  }
   gfx::Size GetMinimumSize() const override { return min_size_; }
   gfx::Size GetMaximumSize() const override { return max_size_; }
   ClientView* CreateClientView(Widget* widget) override {