Merge \"Fix google-explicit-constructor warnings in system/core.\"
am: 405d3e1783

Change-Id: I5a010465364b6e14423b19e8c0f9cffa58ee3152
tree: 529441454ac9871b6f0fd34fa00dbd51647b3017
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/