[CacheStorage] Garbage collect unreferenced caches

content/browser/cache_storage/cache_storage_manager_unittest.cc

Index: content/browser/cache_storage/cache_storage_manager_unittest.cc
diff --git a/content/browser/cache_storage/cache_storage_manager_unittest.cc b/content/browser/cache_storage/cache_storage_manager_unittest.cc
index af0da92c81cfd33a11361822491ad8524f6ac72d..66ec3408450c642b4f628b3c66a47b15fae3b487 100644
--- a/content/browser/cache_storage/cache_storage_manager_unittest.cc
+++ b/content/browser/cache_storage/cache_storage_manager_unittest.cc
@@ -653,6 +653,31 @@ TEST_F(CacheStorageManagerTest, MemoryBackedSizePersistent) {
   EXPECT_EQ(0, cache_storage->MemoryBackedSize());
 }
 
+TEST_F(CacheStorageManagerTest, DeleteUnreferencedCacheDirectories) {
+  // Create a referenced cache.
+  EXPECT_TRUE(Open(origin1_, "foo"));
+  EXPECT_TRUE(CachePut(callback_cache_, GURL("http://example.com/foo")));
+
+  // Create an unreferenced directory next to the referenced one.
+  base::FilePath origin_path = CacheStorageManager::ConstructOriginPath(
+      cache_manager_->root_path(), origin1_);
+  base::FilePath unreferenced_path = origin_path.AppendASCII("bar");
+  EXPECT_TRUE(CreateDirectory(unreferenced_path));
+  EXPECT_TRUE(base::DirectoryExists(unreferenced_path));
+
+  // Create a new StorageManager so that the next time the cache is opened
+  // the unreferenced directory can be deleted.
+  quota_manager_proxy_->SimulateQuotaManagerDestroyed();
+  cache_manager_ = CacheStorageManager::Create(cache_manager_.get());
+
+  // Verify that the referenced cache still works.
+  EXPECT_TRUE(Open(origin1_, "foo"));
+  EXPECT_TRUE(CacheMatch(callback_cache_, GURL("http://example.com/foo")));
+
+  // Verify that the unreferenced cache is gone.
+  EXPECT_FALSE(base::DirectoryExists(unreferenced_path));
+}
+
 class CacheStorageMigrationTest : public CacheStorageManagerTest {
  protected:
   CacheStorageMigrationTest() : cache1_("foo"), cache2_("bar") {}