ConvertServiceTest: remove unnecessary methods

Removed unnecessary implementations for dummy classes, as these methods
are now taken care of in the abstract layer.

Author: hinerm

src/test/java/org/scijava/convert/ConvertServiceTest.java

@@ -611,31 +611,11 @@ public Class<String> getInputType() {
 
 		// -- Dummy conversion methods --
 
-		@Override
-		public boolean canConvert(Class<?> src, Type dest) {
-			return false;
-		}
-
 		@Override
 		public boolean canConvert(Class<?> src, Class<?> dest) {
 			return false;
 		}
 
-		@Override
-		public boolean canConvert(Object src, Type dest) {
-			return false;
-		}
-
-		@Override
-		public boolean canConvert(Object src, Class<?> dest) {
-			return false;
-		}
-
-		@Override
-		public Object convert(Object src, Type dest) {
-			return null;
-		}
-
 		@Override
 		public <T> T convert(Object src, Class<T> dest) {
 			return null;