[tools/perf] Remove remaining references to indexeddb_perf benchmark

tools/auto_bisect/test_data/closed.json

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@@ skipping 49 matching lines @@
     "id": {
      "$t": "http://code.google.com/feeds/issues/p/chromium/issues/full/422382"
     },
     "published": {
      "$t": "2014-10-10T17:07:06.000Z"
     },
     "updated": {
      "$t": "2014-10-20T22:13:38.000Z"
     },
     "title": {
-     "$t": "11.1% regression in indexeddb_perf at 298653:298680"
+     "$t": "11.1% regression in speedometer at 298653:298680"
     },
     "content": {
      "$t": "See the link to graphs below.",
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@@ skipping 50 matching lines @@
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