Turn off the auto color readability of LabelButton in non-high contrast mode

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 <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 136 matching lines @@
 
   // NativeThemeDelegate:
   gfx::Rect GetThemePaintRect() const override;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, Init);
   FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, Label);
   FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, Image);
   FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, LabelAndImage);
   FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, FontList);
+  FRIEND_TEST_ALL_PREFIXES(LabelButtonTest, ResetColorsFromNativeTheme);
 
   void SetTextInternal(const base::string16& text);
 
   // View:
   void ChildPreferredSizeChanged(View* child) override;
 
   // NativeThemeDelegate:
   ui::NativeTheme::Part GetThemePart() const override;
   ui::NativeTheme::State GetThemeState(
       ui::NativeTheme::ExtraParams* params) const override;
@@ skipping 62 matching lines @@
   gfx::HorizontalAlignment horizontal_alignment_;
 
   std::unique_ptr<Painter> focus_painter_;
 
   DISALLOW_COPY_AND_ASSIGN(LabelButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_