Reviewed by Dimitri Glazkov.

        Explicitly set control tints for Chromium/Mac, since the controls'
        NSCell(s) lack an NSView and hence their tint isn't updated
        automatically when the application is activated/deactivated.
        https://bugs.webkit.org/show_bug.cgi?id=28108
        http://crbug.com/18199

        * rendering/RenderThemeChromiumMac.mm:
        (WebCore::updateNSCellControlTint):
        (WebCore::RenderThemeChromiumMac::paintCheckbox):
        (WebCore::RenderThemeChromiumMac::paintRadio):
        (WebCore::RenderThemeChromiumMac::paintButton):
        (WebCore::RenderThemeChromiumMac::paintMenuList):
        (WebCore::RenderThemeChromiumMac::paintSliderThumb):
        (WebCore::RenderThemeChromiumMac::paintSearchField):
        (WebCore::RenderThemeChromiumMac::paintSearchFieldCancelButton):
        (WebCore::RenderThemeChromiumMac::paintSearchFieldResultsDecoration):
        (WebCore::RenderThemeChromiumMac::paintSearchFieldResultsButton):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@47108 268f45cc-cd09-0410-ab3c-d52691b4dbfc