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

ui/views/controls/button/blue_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 "ui/views/controls/button/blue_button.h"
 
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/skia_util.h"
 #include "ui/views/controls/button/label_button_border.h"
 #include "ui/views/test/views_test_base.h"
 
 namespace views {
 
 namespace {
 
 class TestBlueButton : public BlueButton {
  public:
-  TestBlueButton() : BlueButton(NULL, base::ASCIIToUTF16("foo")) {}
+  TestBlueButton() : BlueButton(nullptr) { Init(base::ASCIIToUTF16("foo")); }
   ~TestBlueButton() override {}
 
   using BlueButton::OnNativeThemeChanged;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestBlueButton);
 };
 
 }  // namespace
 
 typedef ViewsTestBase BlueButtonTest;
 
 TEST_F(BlueButtonTest, Border) {
   // Compared to a normal LabelButton...
-  LabelButton button(NULL, base::ASCIIToUTF16("foo"));
+  LabelButton button(nullptr);
+  button.Init(base::ASCIIToUTF16("foo"));
   button.SetBoundsRect(gfx::Rect(gfx::Point(0, 0), button.GetPreferredSize()));
   gfx::Canvas button_canvas(button.bounds().size(), 1.0, true);
   button.border()->Paint(button, &button_canvas);
 
   // ... a special blue border should be used.
   TestBlueButton blue_button;
   blue_button.SetBoundsRect(gfx::Rect(gfx::Point(0, 0),
                             blue_button.GetPreferredSize()));
   gfx::Canvas canvas(blue_button.bounds().size(), 1.0, true);
   blue_button.border()->Paint(blue_button, &canvas);
   EXPECT_EQ(button.GetText(), blue_button.GetText());
   EXPECT_FALSE(gfx::BitmapsAreEqual(button_canvas.ExtractImageRep().sk_bitmap(),
                                     canvas.ExtractImageRep().sk_bitmap()));
 
   // Make sure it's still used after the native theme "changes".
   blue_button.OnNativeThemeChanged(NULL);
   gfx::Canvas canvas2(blue_button.bounds().size(), 1.0, true);
   blue_button.border()->Paint(blue_button, &canvas2);
 
   EXPECT_TRUE(gfx::BitmapsAreEqual(canvas.ExtractImageRep().sk_bitmap(),
                                    canvas2.ExtractImageRep().sk_bitmap()));
 }
 
 }  // namespace views