Remove unused ServiceWorkerStorage::PurgeResources()

ServiceWorkerStorage had two PurgeResources() methods but only
one is used. Remove unused one.

Bug: N/A
Change-Id: Ie53a804cde9dac815e93106e7462faa349f337f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444769Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813068}

content/browser/service_worker/service_worker_storage.cc

@@ -1064,12 +1064,6 @@ void ServiceWorkerStorage::Disable() {
     disk_cache_->Disable();
 }
 
-void ServiceWorkerStorage::PurgeResources(const ResourceList& resources) {
-  if (!has_checked_for_stale_resources_)
-    DeleteStaleResources();
-  StartPurgingResources(resources);
-}
-
 void ServiceWorkerStorage::PurgeResources(
     const std::vector<int64_t>& resource_ids) {
   if (!has_checked_for_stale_resources_)

content/browser/service_worker/service_worker_storage.h

@@ -278,12 +278,11 @@ class CONTENT_EXPORT ServiceWorkerStorage {
 
   void Disable();
 
-  // Schedules deleting |resources| from the disk cache and removing their keys
-  // as purgeable resources from the service worker database. It's OK to call
-  // this for resources that don't have purgeable resource keys, like
+  // Schedules deleting `resource_ids` from the disk cache and removing their
+  // keys as purgeable resources from the service worker database. It's OK to
+  // call this for resources that don't have purgeable resource keys, like
   // uncommitted resources, as long as the caller does its own cleanup to remove
   // the uncommitted resource keys.
-  void PurgeResources(const ResourceList& resources);
   void PurgeResources(const std::vector<int64_t>& resource_ids);
 
   // Applies |policy_updates|.