Certificate Transparency: Fix Pilot log ID comparison.

net/cert/sth_distributor.cc

Index: net/cert/sth_distributor.cc
diff --git a/net/cert/sth_distributor.cc b/net/cert/sth_distributor.cc
index 65a471f584d90a13e79c395f5cafe696b9a3f9ca..0b8df2606660cd0e60a47b9756bc7d3d3b5a95fa 100644
--- a/net/cert/sth_distributor.cc
+++ b/net/cert/sth_distributor.cc
@@ -27,7 +27,7 @@ void STHDistributor::NewSTHObserved(const SignedTreeHead& sth) {
   FOR_EACH_OBSERVER(STHObserver, observer_list_, NewSTHObserved(sth));
 
   if (sth.log_id.compare(0, sth.log_id.size(), kPilotLogID,
-                         arraysize(kPilotLogID)) != 0)
+                         arraysize(kPilotLogID) - 1) != 0)
     return;
 
   const base::TimeDelta sth_age = base::Time::Now() - sth.timestamp;