[Mac] Enable MacViews bookmark editor behind --enable-mac-views-dialogs.

components/constrained_window/constrained_window_views.cc

Index: components/constrained_window/constrained_window_views.cc
diff --git a/components/constrained_window/constrained_window_views.cc b/components/constrained_window/constrained_window_views.cc
index d00551385504274b22bd5666e1d1d8496dd99168..82b01d92bb0ce33697b38f3181da5d292a769acc 100644
--- a/components/constrained_window/constrained_window_views.cc
+++ b/components/constrained_window/constrained_window_views.cc
@@ -166,8 +166,17 @@ views::Widget* CreateBrowserModalDialogViews(views::DialogDelegate* dialog,
              : nullptr;
   views::Widget* widget =
       views::DialogDelegate::CreateDialogWidget(dialog, NULL, parent_view);
-  if (!dialog->UseNewStyleForThisDialog())
+
+#if defined(OS_MACOSX)
+  // On Mac, window modal dialogs are displayed as sheets, so their position is
+  // managed by the parent window.
+  bool requires_positioning = false;
+#else
+  bool requires_positioning = dialog->UseNewStyleForThisDialog();

[msw, 2015/08/21 18:47:02]

nit: decl/init this above the #ifdef block, and just force it false for Mac.

[jackhou1, 2015/08/24 01:41:55]

Done.

+#endif
+  if (!requires_positioning)
     return widget;
+
   ModalDialogHost* host = constrained_window_views_client->
       GetModalDialogHost(parent);
   if (host) {