update_engine: Run clang-format on payload_generator/

BUG=none
TEST=unittest

Change-Id: I00cafb1fc709d8f02119cb0058cfcb0b573ef25d
Reviewed-on: https://chromium-review.googlesource.com/1409927
Commit-Ready: Amin Hassani <ahassani@chromium.org>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Sen Jiang <senj@chromium.org>
diff --git a/payload_generator/deflate_utils.cc b/payload_generator/deflate_utils.cc
index 1bc3b36..a7a0503 100644
--- a/payload_generator/deflate_utils.cc
+++ b/payload_generator/deflate_utils.cc
@@ -31,10 +31,10 @@
 #include "update_engine/payload_generator/squashfs_filesystem.h"
 #include "update_engine/update_metadata.pb.h"
 
-using std::string;
-using std::vector;
 using puffin::BitExtent;
 using puffin::ByteExtent;
+using std::string;
+using std::vector;
 
 namespace chromeos_update_engine {
 namespace deflate_utils {