ResourceLoader: Fix a bunch of double-cancellation/double-error notification cases.

content/browser/cache_storage/cache_storage_blob_to_disk_cache.cc

Index: content/browser/cache_storage/cache_storage_blob_to_disk_cache.cc
diff --git a/content/browser/cache_storage/cache_storage_blob_to_disk_cache.cc b/content/browser/cache_storage/cache_storage_blob_to_disk_cache.cc
index 44b336c165087b7525dc2f4523eeccf7a3b18f32..a375f8c140c634ae79ff0ad72cf1d9c0274c03c3 100644
--- a/content/browser/cache_storage/cache_storage_blob_to_disk_cache.cc
+++ b/content/browser/cache_storage/cache_storage_blob_to_disk_cache.cc
@@ -127,7 +127,7 @@ void CacheStorageBlobToDiskCache::OnContextShuttingDown() {
 
 void CacheStorageBlobToDiskCache::ReadFromBlob() {
   int bytes_read = blob_request_->Read(buffer_.get(), buffer_->size());
-  if (bytes_read >= 0)
+  if (bytes_read != net::ERR_IO_PENDING)
     OnReadCompleted(blob_request_.get(), bytes_read);
 }