[CacheStorage] Garbage collect unreferenced caches

content/browser/cache_storage/cache_storage_manager.h

Index: content/browser/cache_storage/cache_storage_manager.h
diff --git a/content/browser/cache_storage/cache_storage_manager.h b/content/browser/cache_storage/cache_storage_manager.h
index 0499f95524d5cd80341bf810f4a1a837db871309..2d83a65413dd30948e7c910725b4c2d89be4cbee 100644
--- a/content/browser/cache_storage/cache_storage_manager.h
+++ b/content/browser/cache_storage/cache_storage_manager.h
@@ -83,12 +83,13 @@ class CONTENT_EXPORT CacheStorageManager {
     return weak_ptr_factory_.GetWeakPtr();
   }
 
+  base::FilePath root_path() const { return root_path_; }
+
  private:
   friend class CacheStorageContextImpl;
   friend class CacheStorageManagerTest;
   friend class CacheStorageMigrationTest;
   friend class CacheStorageQuotaClient;
-  friend class MigratedLegacyCacheDirectoryNameTest;
 
   typedef std::map<GURL, CacheStorage*> CacheStorageMap;
 
@@ -122,10 +123,11 @@ class CONTENT_EXPORT CacheStorageManager {
       const {
     return request_context_getter_;
   }
+
   base::WeakPtr<storage::BlobStorageContext> blob_storage_context() const {
     return blob_context_;
   }
-  base::FilePath root_path() const { return root_path_; }
+
   const scoped_refptr<base::SequencedTaskRunner>& cache_task_runner() const {
     return cache_task_runner_;
   }