Revert of Change minimum length of Aura overlay scrollbars.

ui/native_theme/native_theme_aura.cc

 // 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.
 
 #include "ui/native_theme/native_theme_aura.h"
 
 #include <limits>
 #include <utility>
 
 #include "base/logging.h"
@@ skipping 15 matching lines @@
 #include "ui/native_theme/native_theme_switches.h"
 #include "ui/native_theme/overlay_scrollbar_constants_aura.h"
 
 namespace ui {
 
 namespace {
 
 // Constants for painting overlay scrollbars. Other properties needed outside
 // this painting code are defined in overlay_scrollbar_constants_aura.h.
 constexpr int kOverlayScrollbarStrokeWidth = 1;
-constexpr int kOverlayScrollbarMinimumLength = 32;
+constexpr int kOverlayScrollbarMinimumLength = 12;
 
 // 2 pixel border with 1 pixel center patch. The border is 2 pixels despite the
 // stroke width being 1 so that the inner pixel can match the center tile
 // color. This prevents color interpolation between the patches.
 constexpr int kOverlayScrollbarBorderPatchWidth = 2;
 constexpr int kOverlayScrollbarCenterPatchSize = 1;
 
 const SkColor kTrackColor = SkColorSetRGB(0xF1, 0xF1, 0xF1);
 
 }  // namespace
@@ skipping 293 matching lines @@
 
 gfx::Rect NativeThemeAura::GetNinePatchAperture(Part part) const {
   DCHECK(SupportsNinePatch(part));
 
   return gfx::Rect(
       kOverlayScrollbarBorderPatchWidth, kOverlayScrollbarBorderPatchWidth,
       kOverlayScrollbarCenterPatchSize, kOverlayScrollbarCenterPatchSize);
 }
 
 }  // namespace ui