tree c7d83c5241d5d999d7cc9ab257a358ff47ed481a
parent 2d8e78510d8c1da8ea14cbccd3217275619eadd0
author Patrick Venture <venture@google.com> 1540952687 -0700
committer Patrick Venture <venture@google.com> 1540952827 -0700

zone: use const reference consistently

In this case, the string is copied and placed into the vector's pointer
list, so it's not necessary to be passed by const reference.  However,
for consistency it's a harmless change.

Change-Id: I5c02e98b4789e18bc9a6756bdd8c5184ad12a232
Signed-off-by: Patrick Venture <venture@google.com>