ServiceWorker: Use mojo's data pipe for respondWith(stream)

content/renderer/cache_storage/cache_storage_dispatcher.cc

Index: content/renderer/cache_storage/cache_storage_dispatcher.cc
diff --git a/content/renderer/cache_storage/cache_storage_dispatcher.cc b/content/renderer/cache_storage/cache_storage_dispatcher.cc
index 6225a787b4cd5d83a09975b6e6de3cea1d85a043..51b09d23ca141b3c6205f567d61419a0e09f58ab 100644
--- a/content/renderer/cache_storage/cache_storage_dispatcher.cc
+++ b/content/renderer/cache_storage/cache_storage_dispatcher.cc
@@ -104,9 +104,6 @@ CacheStorageCacheOperationType CacheOperationTypeFromWebCacheOperationType(
 
 CacheStorageBatchOperation BatchOperationFromWebBatchOperation(
     const blink::WebServiceWorkerCache::BatchOperation& web_operation) {
-  // We don't support streaming for cache.
-  DCHECK(web_operation.response.StreamURL().IsEmpty());
-
   CacheStorageBatchOperation operation;
   operation.operation_type =
       CacheOperationTypeFromWebCacheOperationType(web_operation.operation_type);