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

ui/views/controls/button/blue_button_unittest.cc

Index: ui/views/controls/button/blue_button_unittest.cc
diff --git a/ui/views/controls/button/blue_button_unittest.cc b/ui/views/controls/button/blue_button_unittest.cc
index d2f92a3e4a1cfaf916787122ba8e077f22a42082..881ec649d2352175683ecb3c5938bc0418ca7619 100644
--- a/ui/views/controls/button/blue_button_unittest.cc
+++ b/ui/views/controls/button/blue_button_unittest.cc
@@ -13,32 +13,18 @@
 
 namespace views {
 
-namespace {
-
-class TestBlueButton : public BlueButton {
- public:
-  TestBlueButton() : BlueButton(NULL, 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.InitAsTextbutton(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;
+  BlueButton blue_button(nullptr, base::ASCIIToUTF16("foo"));
   blue_button.SetBoundsRect(gfx::Rect(gfx::Point(0, 0),
                             blue_button.GetPreferredSize()));
   gfx::Canvas canvas(blue_button.bounds().size(), 1.0, true);