test/handle: Don't need a virtual destructor

We aren't ever going to extend the mock implementation and even if we
did, only the base class needs to declare this.

Change-Id: Ie524d44ffc7ca787809ca849fb526540e7cc2fa3
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/src/gpioplus/test/handle.hpp b/src/gpioplus/test/handle.hpp
index 9249ccd..b629e84 100644
--- a/src/gpioplus/test/handle.hpp
+++ b/src/gpioplus/test/handle.hpp
@@ -10,8 +10,6 @@
 class HandleMock : public HandleInterface
 {
   public:
-    virtual ~HandleMock() = default;
-
     MOCK_CONST_METHOD0(getValues, std::vector<uint8_t>());
     MOCK_CONST_METHOD1(getValues, void(std::vector<uint8_t>&));
     MOCK_CONST_METHOD1(setValues, void(const std::vector<uint8_t>&));