Trigger ServiceWorker updates upon navigation more quickly.

BUG=408431

Review URL: https://codereview.chromium.org/537123002

Cr-Commit-Position: refs/heads/master@{#293482}

content/browser/service_worker/service_worker_version.cc

@@ -29,7 +29,7 @@ namespace {
 const int64 kStopWorkerDelay = 30;  // 30 secs.
 
 // Default delay for scheduled update.
-const int kUpdateDelaySeconds = 10;
+const int kUpdateDelaySeconds = 1;
 
 void RunSoon(const base::Closure& callback) {
   if (!callback.is_null())