WidgetDelegateView is its own contents view.

ash/frame/caption_buttons/frame_size_button_unittest.cc

 // Copyright 2014 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 "ash/common/frame/caption_buttons/frame_size_button.h"
 
 #include "ash/common/ash_layout_constants.h"
 #include "ash/common/frame/caption_buttons/frame_caption_button.h"
 #include "ash/common/frame/caption_buttons/frame_caption_button_container_view.h"
 #include "ash/common/wm/window_state.h"
@@ skipping 15 matching lines @@
 namespace test {
 
 namespace {
 
 class TestWidgetDelegate : public views::WidgetDelegateView {
  public:
   TestWidgetDelegate() {}
   ~TestWidgetDelegate() override {}
 
   // Overridden from views::WidgetDelegate:
-  views::View* GetContentsView() override { return this; }
   bool CanResize() const override { return true; }
   bool CanMaximize() const override { return true; }
   bool CanMinimize() const override { return true; }
 
   ash::FrameCaptionButtonContainerView* caption_button_container() {
     return caption_button_container_;
   }
 
  private:
   // Overridden from views::View:
@@ skipping 410 matching lines @@
 
   // None of the buttons should stay pressed and the buttons should have their
   // regular icons.
   EXPECT_TRUE(AllButtonsInNormalState());
   EXPECT_EQ(CAPTION_BUTTON_ICON_MINIMIZE, minimize_button()->icon());
   EXPECT_EQ(CAPTION_BUTTON_ICON_CLOSE, close_button()->icon());
 }
 
 }  // namespace test
 }  // namespace ash