Use the stateless GC::fillRect variant when possible.

Source/platform/scroll/ScrollbarThemeNonMacCommon.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008, 2009 Google Inc.
  *
  * 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 98 matching lines @@
     GraphicsContextStateSaver stateSaver(*context);
     context->setShouldAntialias(false);
 
     for (Vector<IntRect>::const_iterator i = tickmarks.begin(); i != tickmarks.end(); ++i) {
         // Calculate how far down (in %) the tick-mark should appear.
         const float percent = static_cast<float>(i->y()) / scrollbar->totalSize();
 
         // Calculate how far down (in pixels) the tick-mark should appear.
         const int yPos = rect.y() + (rect.height() * percent);
 
-        context->setFillColor(Color(0xCC, 0xAA, 0x00, 0xFF));
         FloatRect tickRect(rect.x(), yPos, rect.width(), 3);
-        context->fillRect(tickRect);
+        context->fillRect(tickRect, Color(0xCC, 0xAA, 0x00, 0xFF));
 
-        context->setFillColor(Color(0xFF, 0xDD, 0x00, 0xFF));
         FloatRect tickStroke(rect.x(), yPos + 1, rect.width(), 1);
-        context->fillRect(tickStroke);
+        context->fillRect(tickStroke, Color(0xFF, 0xDD, 0x00, 0xFF));
     }
 }
 
 } // namespace blink