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

Source/core/html/track/TextTrackCueGeneric.h

 /*
  * Copyright (C) 2013 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 43 matching lines @@
     double baseFontSizeRelativeToVideoHeight() const { return m_baseFontSizeRelativeToVideoHeight; }
     void setBaseFontSizeRelativeToVideoHeight(double size) { m_baseFontSizeRelativeToVideoHeight = size; }
 
     double fontSizeMultiplier() const { return m_fontSizeMultiplier; }
     void setFontSizeMultiplier(double size) { m_fontSizeMultiplier = size; }
 
     String fontName() const { return m_fontName; }
     void setFontName(String name) { m_fontName = name; }
 
     Color foregroundColor() const { return m_foregroundColor; }
-    void setForegroundColor(Color color) { m_foregroundColor = color; }
+
+    void setForegroundColor(RGBA32 color) { m_foregroundColor.setRGB(color); }
 
     Color backgroundColor() const { return m_backgroundColor; }
-    void setBackgroundColor(Color color) { m_backgroundColor = color; }
+    void setBackgroundColor(RGBA32 color) { m_backgroundColor.setRGB(color); }
 
     virtual void videoSizeDidChange(const IntSize&);
 
     virtual bool operator==(const TextTrackCue&) const OVERRIDE;
     virtual bool operator!=(const TextTrackCue& cue) const OVERRIDE
     {
         return !(*this == cue);
     }
 
     virtual TextTrackCue::CueType cueType() const OVERRIDE { return TextTrackCue::Generic; }
 
 private:
     TextTrackCueGeneric(ScriptExecutionContext*, double start, double end, const String&);
 
     Color m_foregroundColor;
     Color m_backgroundColor;
     double m_baseFontSizeRelativeToVideoHeight;
     double m_fontSizeMultiplier;
     String m_fontName;
     bool m_defaultPosition;
 };
 
 } // namespace WebCore
 
 #endif