views::LabelButton should not call virtual methods from its constructor

ui/views/controls/button/custom_button_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 "ui/views/controls/button/custom_button.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/layout.h"
 #include "ui/events/event_utils.h"
 #include "ui/gfx/screen.h"
@@ skipping 197 matching lines @@
   PerformGesture(button(), ui::ET_GESTURE_TAP_CANCEL);
   EXPECT_EQ(CustomButton::STATE_NORMAL, button()->state());
 }
 
 #endif  // !defined(OS_MACOSX) || defined(USE_AURA)
 
 // Ensure subclasses of CustomButton are correctly recognized as CustomButton.
 TEST_F(CustomButtonTest, AsCustomButton) {
   base::string16 text;
 
-  LabelButton label_button(NULL, text);
+  LabelButton label_button(nullptr);
+  label_button.InitAsTextbutton(text);
   EXPECT_TRUE(CustomButton::AsCustomButton(&label_button));
 
   ImageButton image_button(NULL);
   EXPECT_TRUE(CustomButton::AsCustomButton(&image_button));
 
   Checkbox checkbox(text);
   EXPECT_TRUE(CustomButton::AsCustomButton(&checkbox));
 
   RadioButton radio_button(text, 0);
   EXPECT_TRUE(CustomButton::AsCustomButton(&radio_button));
 
   MenuButton menu_button(NULL, text, NULL, false);
   EXPECT_TRUE(CustomButton::AsCustomButton(&menu_button));
 
   Label label;
   EXPECT_FALSE(CustomButton::AsCustomButton(&label));
 
   Link link(text);
   EXPECT_FALSE(CustomButton::AsCustomButton(&link));
 
   Textfield textfield;
   EXPECT_FALSE(CustomButton::AsCustomButton(&textfield));
 }
 
 }  // namespace views