views: Migrate ash_shell buttons to LabelButton

ash/shell/lock_view.cc

Index: ash/shell/lock_view.cc
diff --git a/ash/shell/lock_view.cc b/ash/shell/lock_view.cc
index 16895c6b571ce970b2c6532de7029fb051783b5f..5390ea783c8b1783f41400ce10e95b1054412616 100644
--- a/ash/shell/lock_view.cc
+++ b/ash/shell/lock_view.cc
@@ -11,7 +11,7 @@
 #include "ui/aura/window.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font.h"
-#include "ui/views/controls/button/text_button.h"
+#include "ui/views/controls/button/label_button.h"
 #include "ui/views/corewm/tooltip_controller.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
@@ -25,7 +25,8 @@ class LockView : public views::WidgetDelegateView,
                  public views::ButtonListener {
  public:
   LockView() : unlock_button_(ALLOW_THIS_IN_INITIALIZER_LIST(
-                   new views::NativeTextButton(this, ASCIIToUTF16("Unlock")))) {
+                   new views::LabelButton(this, ASCIIToUTF16("Unlock")))) {
+    unlock_button_->SetStyle(views::Button::STYLE_NATIVE_TEXTBUTTON);
     AddChildView(unlock_button_);
     unlock_button_->set_focusable(true);
   }
@@ -74,7 +75,7 @@ class LockView : public views::WidgetDelegateView,
   }
 
   gfx::Font font_;
-  views::NativeTextButton* unlock_button_;
+  views::LabelButton* unlock_button_;
 
   DISALLOW_COPY_AND_ASSIGN(LockView);
 };