Revert "Remove unneeded argument"

This reverts commit f4457fbec31caa80e594ff4a34cdc14f670b9e2a.

coverageMap.js

@@ -65,7 +65,7 @@ module.exports = class CoverageMap {
    * @param  {String} relative path to host contracts eg: './../contracts'
    * @return {Object} coverage map.
    */
-  generate(events) {
+  generate(events, pathPrefix) {
     for (let idx = 0; idx < events.length; idx++) {
       const event = JSON.parse(events[idx]);
       if (event.topics.indexOf(lineTopic) >= 0) {

runCoveredTests.js

@@ -49,7 +49,7 @@ events = fs.readFileSync('./allFiredEvents').toString().split('\n')
 events.pop();
 //The pop here isn't a bug - there is an empty line at the end of this file, so we
 //don't want to include it as an event.
-coverage.generate(events);
+coverage.generate(events, './../originalContracts/');
 
 fs.writeFileSync('./coverage.json', JSON.stringify(coverage.coverage));