vpn-manager: Remove unusued constant reported by clang.

BUG=chromium:309861
TEST=`FEATURES=test USE=clang emerge-lumpy crash-reporter`

Change-Id: I4877470c079eff2715deb3b69926f2fca96bd6d3
Reviewed-on: https://chromium-review.googlesource.com/173972
Tested-by: Ben Chan <[email protected]>
Reviewed-by: Yunlian Jiang <[email protected]>
Commit-Queue: Ben Chan <[email protected]>
diff --git a/ipsec_manager.cc b/ipsec_manager.cc
index a2c5283..69addb7 100644
--- a/ipsec_manager.cc
+++ b/ipsec_manager.cc
@@ -53,7 +53,6 @@
 
 const char kDefaultCertSlot[] = "0";
 const char kIpsecCaCertsName[] = "cacert.der";
-const char kIpsecConnectionName[] = "ipsec_managed";
 const char kIpsecStarterConfName[] = "ipsec.conf";
 const char kIpsecSecretsName[] = "ipsec.secrets";
 const char kIpsecGroupName[] = "ipsec";