metrics_daemon_test: drop unused vars

BUG=None
TEST=`FEATURES=test emerge-x86-alex platform2` still works

Change-Id: I86aa6a7380d226173c642880a3fc50faf3219d13
Reviewed-on: https://chromium-review.googlesource.com/180333
Reviewed-by: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/metrics/metrics_daemon_test.cc b/metrics/metrics_daemon_test.cc
index 2d8b61a..9f07548 100644
--- a/metrics/metrics_daemon_test.cc
+++ b/metrics/metrics_daemon_test.cc
@@ -33,8 +33,6 @@
 static const int kSecondsPerDay = 24 * 60 * 60;
 
 static const char kTestDir[] = "test";
-static const char kLastFile[] = "test/last";
-static const char kCurrentFile[] = "test/current";
 static const char kFakeDiskStatsPath[] = "fake-disk-stats";
 static const char kFakeDiskStatsFormat[] =
     "    1793     1788    %d   105580    "