DialogDelegate: allow platforms to prevent Cancel being default

ui/views/window/dialog_client_view_unittest.cc

 // Copyright (c) 2012 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 "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/views/controls/button/label_button.h"
+#include "ui/views/style/platform_style.h"
 #include "ui/views/test/test_views.h"
 #include "ui/views/test/views_test_base.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/window/dialog_client_view.h"
 #include "ui/views/window/dialog_delegate.h"
 
 namespace views {
 
 class TestDialogClientView : public DialogClientView {
  public:
@@ skipping 121 matching lines @@
 
   // Reset with just an ok button.
   SetDialogButtons(ui::DIALOG_BUTTON_OK);
   EXPECT_TRUE(client_view()->ok_button()->is_default());
   EXPECT_EQ(NULL, client_view()->cancel_button());
   EXPECT_EQ(GetUpdatedClientBounds().height(), height_with_buttons);
 
   // Reset with just a cancel button.
   SetDialogButtons(ui::DIALOG_BUTTON_CANCEL);
   EXPECT_EQ(NULL, client_view()->ok_button());
-  EXPECT_TRUE(client_view()->cancel_button()->is_default());
+  EXPECT_EQ(client_view()->cancel_button()->is_default(),
+            PlatformStyle::kDialogDefaultButtonCanBeCancel);
   EXPECT_EQ(GetUpdatedClientBounds().height(), height_with_buttons);
 }
 
 TEST_F(DialogClientViewTest, RemoveAndUpdateButtons) {
   // Removing buttons from another context should clear the local pointer.
   SetDialogButtons(ui::DIALOG_BUTTON_OK | ui::DIALOG_BUTTON_CANCEL);
   delete client_view()->ok_button();
   EXPECT_EQ(NULL, client_view()->ok_button());
   delete client_view()->cancel_button();
   EXPECT_EQ(NULL, client_view()->cancel_button());
@@ skipping 83 matching lines @@
   EXPECT_EQ(no_extra_view_size.width(), client_view()->bounds().width());
 
   // Try with a reduced-size dialog.
   extra_view->SetVisible(true);
   client_view()->SetBoundsRect(gfx::Rect(gfx::Point(0, 0), no_extra_view_size));
   client_view()->Layout();
   EXPECT_GT(width_of_extra_view, extra_view->bounds().width());
 }
 
 }  // namespace views