tree 8fc195887d4dfd4204463078632a904cc4912736
parent 27c1ab2095f25253d0920eb6afe7cd2791a708dc
author Tao Bao <tbao@google.com> 1438813227 -0700
committer Tao Bao <tbao@google.com> 1438891500 -0700

updater: Clean up char* with std::string.

So we can remove a few free()s. And also replace a few pointers with
references.

Change-Id: I4b6332216704f4f9ea4a044b8d4bb7aa42a7ef26