Reviewed, tweaked and landed by Alexey.

        http://bugs.webkit.org/show_bug.cgi?id=11798
        [CSS 3] missing cursor support for 'none'

        * Resources/noneCursor.png: Added.
        * WebCore.xcodeproj/project.pbxproj:
        * css/CSSComputedStyleDeclaration.cpp:
        (WebCore::CSSComputedStyleDeclaration::getPropertyCSSValue):
        * css/CSSValueKeywords.in:
        * css/cssparser.cpp: Also fixed previously broken -webkit-background-composite: copy.
        * manual-tests/cursor.html:
        * page/EventHandler.cpp:
        (WebCore::selectCursor):
        * platform/Cursor.h:
        * platform/gdk/CursorGdk.cpp:
        (WebCore::noneCursor):
        * platform/mac/CursorMac.mm:
        (WebCore::noneCursor):
        * platform/qt/CursorQt.cpp:
        (WebCore::noneCursor):
        * platform/win/CursorWin.cpp:
        (WebCore::noneCursor):
        * rendering/RenderStyle.h:
        (WebCore::):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@18270 268f45cc-cd09-0410-ab3c-d52691b4dbfc