Fixed: frame/bounds change notification was sent unconditionally.

Previously, calling setPostsFrameChangedNotifications:YES or setPostsBoundsChangedNotifications:YES would immediately result in the notification being sent. Cocoa will only send in this context if:

- setPosts[Frame/Bounds]ChangedNotifications:NO was called.
- The frame/bounds changed between that call and the call to setPosts[Frame/Bounds]ChangedNotifications:YES.

We are currently not tracking pending changes, so this commit removes the sending of the notification completely in those methods.

Fixes #1076