Reviewed by Simon Fraser.

        https://bugs.webkit.org/show_bug.cgi?id=24197 and
        https://bugs.webkit.org/show_bug.cgi?id=23512

        The Windows version of cgColor() is conditionally compiled using
        !PLATFORM(MAC) change this to PLATFORM(WIN_OS) so that Chrome
        can use the OS X version instead of the Windows version.

        Also rename cgColor() -> createCGColor()

        No observable change in behavior, so no test.

        * platform/graphics/Color.h:
        * platform/graphics/cg/ColorCG.cpp:
        (WebCore::createCGColor):
        * platform/graphics/cg/GraphicsContextCG.cpp:
        (WebCore::GraphicsContext::setPlatformShadow):
        * platform/graphics/mac/ColorMac.mm:
        (WebCore::createCGColor):
        * platform/graphics/mac/GraphicsContextMac.mm:
        (WebCore::GraphicsContext::drawFocusRing):
        * platform/graphics/mac/GraphicsLayerCA.mm:
        (WebCore::setLayerBorderColor):
        (WebCore::setLayerBackgroundColor):
        (WebCore::GraphicsLayerCA::setBackgroundColor):
        * platform/graphics/win/GraphicsContextCGWin.cpp:
        (WebCore::GraphicsContext::drawFocusRing):
        * svg/graphics/filters/cg/SVGFEHelpersCg.mm:
        (WebCore::ciColor):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@41345 268f45cc-cd09-0410-ab3c-d52691b4dbfc