Deleting a bookmark
  To delete any bookmark:
  
    - Open the Bookmarks view ( 
     Window > Show View >
    Other... > General > Bookmarks). Window > Show View >
    Other... > General > Bookmarks).
- Right-click the bookmark that you want to delete and select Delete from the pop-up menu.
If you have added bookmarks for specific lines within a source file, you can also delete them while editing the
  file by right-clicking the bookmark icon in the editor area.
  Bookmarks
  Creating a bookmark for an entire file
  Creating a bookmark within a file