Extract ServiceWorkerVersionTest and relevant tests from

service_worker_browsertest.cc

ServiceWorkerBrowserTest is a simple fixture, it is unnecessary
for ServiceWorkerVersionBrowserTest to inherit from it. This patch
extracts ServiceWorkerVersionTest and relevant tests from
service_worker_browsertest.cc to service_worker_version_browsertest.cc

Bug: 931094
Change-Id: I571680beb4af9ad7c01a039bf9ea557e9e9c038c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1966582
Commit-Queue: Wei4 Wang <wei4.wang@intel.com>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726667}

content/test/BUILD.gn

@@ -985,6 +985,7 @@ test("content_browsertests") {
     "../browser/service_worker/service_worker_file_upload_browsertest.cc",
     "../browser/service_worker/service_worker_no_best_effort_tasks_browsertest.cc",
     "../browser/service_worker/service_worker_process_browsertest.cc",
+    "../browser/service_worker/service_worker_version_browsertest.cc",
     "../browser/session_history_browsertest.cc",
     "../browser/shape_detection/shape_detection_browsertest.cc",
     "../browser/site_per_process_browsertest.cc",