Remove leftover NullCmdLineLogger

Author: glankk

test/testcppcheck.cpp

@@ -16,7 +16,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "cmdlineparser.h"
 #include "color.h"
 #include "cppcheck.h"
 #include "errorlogger.h"
@@ -60,22 +59,6 @@ class TestCppcheck : public TestFixture {
         }
     };
 
-    class NullCmdLineLogger : public CmdLineLogger
-    {
-    public:
-        void printMessage(const std::string &) override
-        {
-        }
-
-        void printError(const std::string &) override
-        {
-        }
-
-        void printRaw(const std::string &) override
-        {
-        }
-    };
-
     void run() override {
         TEST_CASE(getErrorMessages);
         TEST_CASE(checkWithFile);