Revision 49031

Ensure that the context menu items displayed in ChromeFrame rendered pages are enabled/disabled correctly. To achieve this we now
have a UpdateMenuItemStates function in the RenderViewContextMenuViews class which calls into the underlying menu's UpdateStates
function which enables/disables items correctly.

Fixes bug http://code.google.com/p/chromium/issues/detail?id=45785

Bug=45785

Review URL: http://codereview.chromium.org/2627005