Revert of Change minimum length of Aura overlay scrollbars.

third_party/WebKit/Source/platform/scroll/ScrollbarThemeAura.cpp

 /*
  * Copyright (c) 2008, 2009, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 195 matching lines @@
   }
   if (scrollbar.height() <= 2 * bs.height())
     return IntRect();
   return IntRect(scrollbar.x(), scrollbar.y() + bs.height(), scrollbar.width(),
                  scrollbar.height() - 2 * bs.height());
 }
 
 int ScrollbarThemeAura::minimumThumbLength(
     const ScrollbarThemeClient& scrollbar) {
   if (scrollbar.orientation() == VerticalScrollbar) {
-    return Platform::current()
-        ->themeEngine()
-        ->getSize(WebThemeEngine::PartScrollbarVerticalThumb)
-        .height;
+    IntSize size = Platform::current()->themeEngine()->getSize(
+        WebThemeEngine::PartScrollbarVerticalThumb);
+    return size.height();
   }
 
-  return Platform::current()
-      ->themeEngine()
-      ->getSize(WebThemeEngine::PartScrollbarHorizontalThumb)
-      .width;
+  IntSize size = Platform::current()->themeEngine()->getSize(
+      WebThemeEngine::PartScrollbarHorizontalThumb);
+  return size.width();
 }
 
 void ScrollbarThemeAura::paintTrackBackground(GraphicsContext& context,
                                               const Scrollbar& scrollbar,
                                               const IntRect& rect) {
   // Just assume a forward track part. We only paint the track as a single piece
   // when there is no thumb.
   if (!hasThumb(scrollbar) && !rect.isEmpty())
     paintTrackPiece(context, scrollbar, rect, ForwardTrackPart);
 }
@@ skipping 116 matching lines @@
   }
 
   // HorizontalScrollbar
   int squareSize = scrollbar.height();
   return IntSize(
       scrollbar.width() < 2 * squareSize ? scrollbar.width() / 2 : squareSize,
       squareSize);
 }
 
 }  // namespace blink