bmc/test: cleanup remove unused declarations

Remove unused using declarations.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: If975e789745f4c625c84fba376d85f805f38f3e0
diff --git a/bmc/test/firmware_sessionstat_unittest.cpp b/bmc/test/firmware_sessionstat_unittest.cpp
index 896dd70..0736293 100644
--- a/bmc/test/firmware_sessionstat_unittest.cpp
+++ b/bmc/test/firmware_sessionstat_unittest.cpp
@@ -11,7 +11,7 @@
 
 namespace ipmi_flash
 {
-using ::testing::Eq;
+
 using ::testing::Return;
 
 class FirmwareSessionStateTestIpmiOnly : public IpmiOnlyFirmwareTest