Mac: make save/open dialogs operate as tab-modal sheets....

chrome/browser/tab_contents/constrained_window.cc

Index: chrome/browser/tab_contents/constrained_window.cc
diff --git a/chrome/browser/tab_contents/constrained_window.cc b/chrome/browser/tab_contents/constrained_window.cc
new file mode 100644
index 0000000000000000000000000000000000000000..40f25cea7c685593e95b95b0c87de813f33212c6
--- /dev/null
+++ b/chrome/browser/tab_contents/constrained_window.cc
@@ -0,0 +1,19 @@
+// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "constrained_window.h"
+
+bool ConstrainedWindow::ParentWillDo(ConstrainedWindow::Event event) {
+  switch(event) {
+    // "Content-area" constrained windows should close on |kEventNavigate|.
+    case kEventNavigate:
+      CloseConstrainedWindow();
+      return true;
+
+    // Do nothing.
+    default:
+      break;
+  }
+  return false;
+}