Fix a crash in PrintSpooler.

If the user cancels printing we cancel the current
pring operation in the RemotePrintDocument which is
a state machine enforcing valid state transitions.
A valid transition was not allowed: finishing after
canceled.

bug:17182301

Change-Id: Iccf3a78d7dc736a64bf5c44941a8f8064dcd0ec3
1 file changed