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..489ec63a632a40346363a38565a5b125735439e2 100644
--- a/ui/views/controls/button/blue_button_unittest.cc
+++ b/ui/views/controls/button/blue_button_unittest.cc
@@ -17,7 +17,7 @@ namespace {
 
 class TestBlueButton : public BlueButton {
  public:
-  TestBlueButton() : BlueButton(NULL, base::ASCIIToUTF16("foo")) {}
+  TestBlueButton() : BlueButton(nullptr) { Init(base::ASCIIToUTF16("foo")); }
   ~TestBlueButton() override {}
 
   using BlueButton::OnNativeThemeChanged;
@@ -32,7 +32,8 @@ 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);