[tz] Asia/Harbin, Asia/Chongqing and Asia/Kashgar

[Paul Eggert]

On 05/13/2017 04:05 PM, Phake Nick wrote:
> given that Asia/Ishigaki were deleted from this database in 1999 when 
> it's found to be not in use, is there any reason preventing the same 
> to be done to Asia/Harbin, Asia/Chongqing, and Asia/Kashgar?

We've been more careful recently about backward compatbility with names 
even if they were mistakes, whereas back in 1999 we didn't care as much.