Allow constexpr variables of TimeDelta type.

extensions/browser/quota_service_unittest.cc

Index: extensions/browser/quota_service_unittest.cc
diff --git a/extensions/browser/quota_service_unittest.cc b/extensions/browser/quota_service_unittest.cc
index b4b95991d8beeb2ac9d1fa99ee2f2c453c36a1ee..dd73849be113dcf7c99919901da76a34cd72f74f 100644
--- a/extensions/browser/quota_service_unittest.cc
+++ b/extensions/browser/quota_service_unittest.cc
@@ -30,7 +30,6 @@ namespace {
 const char kGenericName[] = "name";
 const Config kFrozenConfig = {0, TimeDelta::FromDays(0)};
 const Config k2PerMinute = {2, TimeDelta::FromMinutes(1)};
-const Config k20PerHour = {20, TimeDelta::FromHours(1)};
 const TimeTicks kStartTime = TimeTicks();
 const TimeTicks k1MinuteAfterStart = kStartTime + TimeDelta::FromMinutes(1);