adjustment: Remove clamp_page from header
adjustment: Remove clamp_page from header

This function will never re-appear, so remove it from the header.

pwithnall/mx,pwithnall/mx,clutter-project/mx,jonnylamb/mx,pwithnall/mx,clutter-project/mx,clutter-project/mx,clutter-project/mx,jonnylamb/mx,pwithnall/mx,jonnylamb/mx,jonnylamb/mx