Merge changes I70c94c4b,Ifd8769ed am: 11d18f1491 am: 974da4b603
am: f4115df5ed

* commit 'f4115df5edd9491af67019d5a5d1399db08e7d1b':
  adb: make mkdirs/secure_mkdirs do what they say.
  adb: remove use of mkdirs from `adb backup`.