Line break fixes to chat.go and files.go

Author: kinarr

go/chat.go

@@ -148,4 +148,3 @@ func ChatStreamingWithImages() error {
 
 	return nil
 }
-

go/files.go

@@ -366,4 +366,4 @@ func FilesDelete() error {
 	}
 	return fmt.Errorf("expected an error when using deleted file")
 	// [END files_delete]
-}
+}