ServiceWorker: Enabled script streaming by default

Bug: 754139
Change-Id: I3a81eed8d8dbf406bb0188ae01b03630ba3199b3
Reviewed-on: https://chromium-review.googlesource.com/704421
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509357}

content/public/common/content_features.cc

@@ -276,7 +276,7 @@ const base::Feature kServiceWorkerPaymentApps{
 
 // Streaming installed scripts on starting service workers.
 const base::Feature kServiceWorkerScriptStreaming{
-    "ServiceWorkerScriptStreaming", base::FEATURE_DISABLED_BY_DEFAULT};
+    "ServiceWorkerScriptStreaming", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // http://tc39.github.io/ecmascript_sharedmem/shmem.html
 const base::Feature kSharedArrayBuffer{"SharedArrayBuffer",