[js-perf-test] Fix JSON syntax for RegExp tests

BUG=v8:5339
NOTRY=true

Review-Url: https://codereview.chromium.org/2532013003
Cr-Commit-Position: refs/heads/master@{#41317}

test/js-perf-test/RegExp.json

@@ -36,7 +36,7 @@
         "slow_replace.js",
         "slow_search.js",
         "slow_split.js",
-        "slow_test.js",
+        "slow_test.js"
       ],
       "results_regexp": "^%s\\-RegExp\\(Score\\): (.+)$",
       "tests": [
@@ -54,8 +54,8 @@
         {"name": "SlowReplace"},
         {"name": "SlowSearch"},
         {"name": "SlowSplit"},
-        {"name": "SlowTest"},
+        {"name": "SlowTest"}
       ]
-    },
+    }
   ]
 }

test/js-perf-test/RegExp/RegExpTests.json

@@ -36,7 +36,7 @@
         "slow_replace.js",
         "slow_search.js",
         "slow_split.js",
-        "slow_test.js",
+        "slow_test.js"
       ],
       "results_regexp": "^%s\\-RegExp\\(Score\\): (.+)$",
       "tests": [
@@ -54,7 +54,7 @@
         {"name": "SlowReplace"},
         {"name": "SlowSearch"},
         {"name": "SlowSplit"},
-        {"name": "SlowTest"},
+        {"name": "SlowTest"}
       ]
     }
   ]