S13nServiceWorker: Skip InitializeHandler tests

As a comment in ServiceWorkerRequestHandler::InitializeHandler()
says[1], we may call it but do nothing when S13nServiceWorker
is enabled. Skip tests for InitializeHandler() when S13nServiceWorker
is enabled.

[1] https://cs.chromium.org/chromium/src/content/browser/service_worker/service_worker_request_handler.cc?l=232&rcl=e09f67110c9a517c981814b643b69c8de0833aac

Bug: 860361
Change-Id: I55afa47c165c33d82b38e9e2b89b153ff8aaffb2
Reviewed-on: https://chromium-review.googlesource.com/1144580
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576753}

content/browser/service_worker/service_worker_request_handler_unittest.cc

@@ -25,6 +25,7 @@
 #include "services/network/public/mojom/request_context_frame_type.mojom.h"
 #include "storage/browser/blob/blob_storage_context.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/blink/public/common/service_worker/service_worker_utils.h"
 
 namespace content {
 namespace service_worker_request_handler_unittest {
@@ -119,6 +120,11 @@ class ServiceWorkerRequestHandlerTest : public testing::Test {
                                    const std::string& method,
                                    bool skip_service_worker,
                                    ResourceType resource_type) {
+    // Skip handler initialization tests when S13nServiceWorker is enabled
+    // because we don't use this path. See also comments in
+    // ServiceWorkerRequestHandler::InitializeHandler().
+    if (blink::ServiceWorkerUtils::IsServicificationEnabled())
+      return;
     InitializeProviderHostForWindow();
     std::unique_ptr<net::URLRequest> request = CreateRequest(url, method);
     InitializeHandler(request.get(), skip_service_worker, resource_type);