Enable new checkbox style by default (Linux/CrOS only)

ui/base/native_theme/native_theme_base.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_BASE_NATIVE_THEME_NATIVE_THEME_BASE_H_
 #define UI_BASE_NATIVE_THEME_NATIVE_THEME_BASE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "skia/ext/platform_canvas.h"
@@ skipping 141 matching lines @@
                      int y,
                      const SkPaint& paint) const;
   void DrawBox(SkCanvas* canvas,
                const gfx::Rect& rect,
                const SkPaint& paint) const;
   SkScalar Clamp(SkScalar value,
                  SkScalar min,
                  SkScalar max) const;
   SkColor OutlineColor(SkScalar* hsv1, SkScalar* hsv2) const;
 
-  // Returns whether the new experimental vector-graphics based checkbox and
-  // radiobutton style is enabled.
+  // Returns whether the new vector-graphics based checkbox and radio button
+  // style is enabled.
   bool IsNewCheckboxStyleEnabled(SkCanvas* canvas) const;
 
   // Paint the common parts of the new (experimental) checkboxes and radio
   // buttons.
   // borderRadius specifies how rounded the corners should be.
   SkRect PaintCheckboxRadioNewCommon(
       SkCanvas* canvas,
       State state,
       const gfx::Rect& rect,
       const SkScalar borderRadius) const;
@@ skipping 16 matching lines @@
 
   unsigned int scrollbar_width_;
   unsigned int scrollbar_button_length_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeThemeBase);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_NATIVE_THEME_NATIVE_THEME_BASE_H_