Just set borders once when creating a views::LabelButton

ui/views/controls/button/label_button.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 20 matching lines @@
   LabelButton(ButtonListener* listener, const base::string16& text);
   ~LabelButton() override;
 
   // Get or set the image shown for the specified button state.
   // GetImage returns the image for STATE_NORMAL if the state's image is empty.
   virtual const gfx::ImageSkia& GetImage(ButtonState for_state);
   void SetImage(ButtonState for_state, const gfx::ImageSkia& image);
 
   // Get or set the text shown on the button.
   const base::string16& GetText() const;
-  virtual void SetText(const base::string16& text);
+  void SetText(const base::string16& text);
 
   // Set the text color shown for the specified button state.
   void SetTextColor(ButtonState for_state, SkColor color);
 
   // Set drop shadows underneath the text.
   void SetTextShadows(const gfx::ShadowValues& shadows);
 
   // Sets whether subpixel rendering is used on the label.
   void SetTextSubpixelRenderingEnabled(bool enabled);
 
@@ skipping 140 matching lines @@
   int image_label_spacing_;
 
   scoped_ptr<Painter> focus_painter_;
 
   DISALLOW_COPY_AND_ASSIGN(LabelButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_