block: remove per-queue plugging

Code has been converted over to the new explicit on-stack plugging,
and delay users have been converted to use the new API for that.
So lets kill off the old plugging along with aops->sync_page().

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/fs/nilfs2/page.h b/fs/nilfs2/page.h
index 622df27..ba4d6fd 100644
--- a/fs/nilfs2/page.h
+++ b/fs/nilfs2/page.h
@@ -63,8 +63,7 @@
 void nilfs_clear_dirty_pages(struct address_space *);
 void nilfs_mapping_init_once(struct address_space *mapping);
 void nilfs_mapping_init(struct address_space *mapping,
-			struct backing_dev_info *bdi,
-			const struct address_space_operations *aops);
+			struct backing_dev_info *bdi);
 unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned);
 unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
 					    sector_t start_blk,