For example, void function(size_t size, size_t stride); then it should be ok to leave the "size" in the function signature.
Some tips: The file to modify is Tools/Scripts/webkitpy/style/checkers/cpp.py The function which loops over the variables and does the check is check_function_definition. Right now _check_parameter_name_against_text is the function which does the error message on a per parameter basis, but that will have to change to do this fix. The unit test is in Tools/Scripts/webkitpy/style/checkers/cpp_unittest.py Look for the function test_parameter_names