Rename JSONResultsGeneratorBase to JSONResultsGenerator
https://bugs.webkit.org/show_bug.cgi?id=114553

Reviewed by Philippe Normand.

Renamed now that we've got rid of the old JSONResultsGenerator in r148352.

* Scripts/webkitpy/layout_tests/layout_package/json_layout_results_generator.py:
(JSONLayoutResultsGenerator):
* Scripts/webkitpy/layout_tests/layout_package/json_results_generator.py:
(JSONResultsGenerator):
* Scripts/webkitpy/layout_tests/layout_package/json_results_generator_unittest.py:
(JSONGeneratorTest._test_json_generation):
(JSONGeneratorTest._verify_json_results):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148353 268f45cc-cd09-0410-ab3c-d52691b4dbfc