[MC-8541] Beds can't be broken in adventure mode

Reproducible using creative to get the bed item. Then switch to adventure.

1. Place the bed
2. Try to remove

Minecraftwiki says it can be broken w/ any tool.

Environment

Windows XP 32-bit
Java(TM) SE Runtime Environment (build 1.7.0_07-b11)
Java HotSpot(TM) Client VM (build 23.3-b01, mixed mode, sharing)

Adventure mode is different, you need the assigned tool. Since the bed is wood, you'll need an axe.

It doesn't work with any of:

1. Sword
2. Axe
3. Shovel
4. Pickaxe

Confirmed.
No tool, sword or hand can destroy a bed.

Resolved as duplicate of MC-2789 - there are all unbreakable blocks summarized.