[CT] Split benchmarkArgs around one or more consecutive white spaces

ct/go/worker_scripts/run_chromium_perf/main.go

Index: ct/go/worker_scripts/run_chromium_perf/main.go
diff --git a/ct/go/worker_scripts/run_chromium_perf/main.go b/ct/go/worker_scripts/run_chromium_perf/main.go
index 934727a9f384cf071cf6092a1a93542ba11bab7a..8ceea37a4b6372b526069a98fdb427e6b0b24a83 100644
--- a/ct/go/worker_scripts/run_chromium_perf/main.go
+++ b/ct/go/worker_scripts/run_chromium_perf/main.go
@@ -316,7 +316,7 @@ func runBenchmark(fileInfoName, pathToPagesets, pathToPyFiles, localOutputDir, c
 	}
 	// Split benchmark args if not empty and append to args.
 	if *benchmarkExtraArgs != "" {
-		for _, benchmarkArg := range strings.Split(*benchmarkExtraArgs, " ") {
+		for _, benchmarkArg := range strings.Fields(*benchmarkExtraArgs) {
 			args = append(args, benchmarkArg)
 		}
 	}