Revert of Replace pinch scrollbars with regular scrollbars.

Source/platform/scroll/ScrollbarThemeAndroid.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 14 matching lines @@
 
 #include "config.h"
 #include "platform/scroll/ScrollbarTheme.h"
 
 #include "platform/scroll/ScrollbarThemeOverlay.h"
 
 namespace blink {
 
 ScrollbarTheme* ScrollbarTheme::nativeTheme()
 {
-    return ScrollbarThemeOverlay::mobileTheme();
+    DEFINE_STATIC_LOCAL(ScrollbarThemeOverlay, theme, (3, 3, ScrollbarThemeOverlay::DisallowHitTest, Color(128, 128, 128, 128)));
+    return &theme;
 }
 
 } // namespace blink