Revert r154797: "Move isValid/isCurrentColor from Color to StyleColor"

Source/core/rendering/RenderThemeChromiumMac.mm

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Google, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 376 matching lines @@
 }
 
 Color RenderThemeChromiumMac::systemColor(CSSValueID cssValueId) const
 {
     {
         HashMap<int, RGBA32>::iterator it = m_systemColorCache.find(cssValueId);
         if (it != m_systemColorCache.end())
             return it->value;
     }
 
-    Color color = Color::transparent;
+    Color color;
     switch (cssValueId) {
         case CSSValueActiveborder:
             color = convertNSColorToColor([NSColor keyboardFocusIndicatorColor]);
             break;
         case CSSValueActivecaption:
             color = convertNSColorToColor([NSColor windowFrameTextColor]);
             break;
         case CSSValueAppworkspace:
             color = convertNSColorToColor([NSColor headerColor]);
             break;
@@ skipping 80 matching lines @@
         case CSSValueWindowframe:
             color = convertNSColorToColor([NSColor windowFrameColor]);
             break;
         case CSSValueWindowtext:
             color = convertNSColorToColor([NSColor windowFrameTextColor]);
             break;
         default:
             break;
     }
 
-    if (!color.alpha())
+    if (!color.isValid())
         color = RenderTheme::systemColor(cssValueId);
 
-    if (color.alpha())
+    if (color.isValid())
         m_systemColorCache.set(cssValueId, color.rgb());
 
     return color;
 }
 
 bool RenderThemeChromiumMac::isControlStyled(const RenderStyle* style, const CachedUAStyle& uaStyle) const
 {
     if (style->appearance() == TextFieldPart || style->appearance() == TextAreaPart || style->appearance() == ListboxPart)
         return style->border() != uaStyle.border || style->boxShadow();
 
@@ skipping 728 matching lines @@
     float arrowHeight = baseArrowHeight * fontScale;
     float arrowWidth = baseArrowWidth * fontScale;
     float leftEdge = bounds.maxX() - arrowPaddingRight * o->style()->effectiveZoom() - arrowWidth;
     float spaceBetweenArrows = baseSpaceBetweenArrows * fontScale;
 
     if (bounds.width() < arrowWidth + arrowPaddingLeft * o->style()->effectiveZoom())
         return false;
 
     GraphicsContextStateSaver stateSaver(*paintInfo.context);
 
-    paintInfo.context->setFillColor(o->resolveColor(CSSPropertyColor));
+    paintInfo.context->setFillColor(o->style()->visitedDependentColor(CSSPropertyColor));
     paintInfo.context->setStrokeStyle(NoStroke);
 
     FloatPoint arrow1[3];
     arrow1[0] = FloatPoint(leftEdge, centerY - spaceBetweenArrows / 2.0f);
     arrow1[1] = FloatPoint(leftEdge + arrowWidth, centerY - spaceBetweenArrows / 2.0f);
     arrow1[2] = FloatPoint(leftEdge + arrowWidth / 2.0f, centerY - spaceBetweenArrows / 2.0f - arrowHeight);
 
     // Draw the top arrow
     paintInfo.context->drawConvexPolygon(3, arrow1, true);
 
@@ skipping 755 matching lines @@
 
 bool RenderThemeChromiumMac::shouldUseFallbackTheme(RenderStyle* style) const
 {
     ControlPart part = style->appearance();
     if (part == CheckboxPart || part == RadioPart)
         return style->effectiveZoom() != 1;
     return false;
 }
 
 } // namespace WebCore