fix(build): don’t read out chrome perflogs during e2e tests

We do this as we are seeing flakes in Chrome with ECONNREFUSED.

Also reuses the same browser window.

Also reenables the infinite scroll benchmark

Closes #1137

modules/benchmarks/e2e_test/naive_infinite_scroll_perf.es6

@@ -7,8 +7,7 @@ describe('ng2 naive infinite scroll benchmark', function () {
   afterEach(perfUtil.verifyNoBrowserErrors);
 
   [1, 2, 4].forEach(function(appSize) {
-    // TODO: reenable these tests when the are passing. See issue #1137
-    xit('should run scroll benchmark and collect stats for appSize = ' +
+    it('should run scroll benchmark and collect stats for appSize = ' +
         appSize, function(done) {
       perfUtil.runBenchmark({
         url: URL,