test: Replace the C++ MOCK_METHOD<n> macros with the new MOCK_METHOD

Change-Id: I5099c727e9e918f19fa61acc91ef75250ebc6fa6
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/bmc/test/triggerable_mock.hpp b/bmc/test/triggerable_mock.hpp
index de2b025..0db90ee 100644
--- a/bmc/test/triggerable_mock.hpp
+++ b/bmc/test/triggerable_mock.hpp
@@ -15,9 +15,10 @@
 class TriggerMock : public TriggerableActionInterface
 {
   public:
-    MOCK_METHOD0(trigger, bool());
-    MOCK_METHOD0(abort, void());
-    MOCK_METHOD0(status, ActionStatus());
+    MOCK_METHOD(bool, trigger, (), (override));
+    MOCK_METHOD(void, abort, (), (override));
+    MOCK_METHOD(ActionStatus, status, (), (override));
+
     using TriggerableActionInterface::cb;
 };