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

Source/core/page/Frame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 441 matching lines @@
     VisiblePosition next = position.next();
     if (RefPtr<Range> nextCharacterRange = makeRange(position, next)) {
         LayoutRect rect = editor().firstRectForRange(nextCharacterRange.get());
         if (rect.contains(framePoint))
             return nextCharacterRange.release();
     }
 
     return 0;
 }
 
-void Frame::createView(const IntSize& viewportSize, const StyleColor& backgroundColor, bool transparent,
+void Frame::createView(const IntSize& viewportSize, const Color& backgroundColor, bool transparent,
     const IntSize& fixedLayoutSize, bool useFixedLayout, ScrollbarMode horizontalScrollbarMode, bool horizontalLock,
     ScrollbarMode verticalScrollbarMode, bool verticalLock)
 {
     ASSERT(this);
     ASSERT(m_page);
 
     bool isMainFrame = this == m_page->mainFrame();
 
     if (isMainFrame && view())
         view()->setParentVisible(false);
 
     setView(0);
 
     RefPtr<FrameView> frameView;
     if (isMainFrame) {
         frameView = FrameView::create(this, viewportSize);
         frameView->setFixedLayoutSize(fixedLayoutSize);
         frameView->setUseFixedLayout(useFixedLayout);
     } else
         frameView = FrameView::create(this);
 
     frameView->setScrollbarModes(horizontalScrollbarMode, verticalScrollbarMode, horizontalLock, verticalLock);
 
     setView(frameView);
 
     if (backgroundColor.isValid())
-        frameView->updateBackgroundRecursively(backgroundColor.color(), transparent);
+        frameView->updateBackgroundRecursively(backgroundColor, transparent);
 
     if (isMainFrame)
         frameView->setParentVisible(true);
 
     if (ownerRenderer())
         ownerRenderer()->setWidget(frameView);
 
     if (HTMLFrameOwnerElement* owner = ownerElement())
         view()->setCanHaveScrollbars(owner->scrollingMode() != ScrollbarAlwaysOff);
 }
@@ skipping 208 matching lines @@
     if (!m_page)
         return 0;
 
     double ratio = m_page->deviceScaleFactor();
     if (RuntimeEnabledFeatures::devicePixelRatioIncludesZoomEnabled())
         ratio *= pageZoomFactor();
     return ratio;
 }
 
 } // namespace WebCore