Set WorkerSettings of ServiceWorkerGlobalScope.

I'm planing to add MixedContentChecking related settings to
WorkerSettings for off-main-thread-fetch.
But WorkerSettings is not set correctly in ServiceWorkerGlobalScope.
So this CL just adds SetWorkerSettings() in
ServiceWorkerGlobalScope::Create().

BUG=607575, 443374

Change-Id: I0e32bb84ce316b7125bfe11facfe5182095ae63f
Reviewed-on: https://chromium-review.googlesource.com/571207Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486701}

third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp

@@ -84,6 +84,7 @@ ServiceWorkerGlobalScope* ServiceWorkerGlobalScope::Create(
       startup_data->worker_v8_settings_.v8_cache_options_);
   context->ApplyContentSecurityPolicyFromVector(
       *startup_data->content_security_policy_headers_);
+  context->SetWorkerSettings(std::move(startup_data->worker_settings_));
   if (!startup_data->referrer_policy_.IsNull())
     context->ParseAndSetReferrerPolicy(startup_data->referrer_policy_);
   context->SetAddressSpace(startup_data->address_space_);