Sanity-check paths of files to be restored

(cherry picked from commit 7d51cc701a6735cf455af8479f56c9c0b2109e02)
Bug: 16298491
Change-Id: I0c2d6523c9d152dad4d27d06d3853afd432e5af7
Merge remote-tracking branch 'cyan/cm-11.0' into cm-11.0