Removes a given key and its associated value from the dictionary.
Original signature is '- (void)removeObjectForKey:(id)aKey'
Available in Mac OS X v10.0 and later.


- aKey (Id)
- The key to remove.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)