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/payload_signer.h b/payload_generator/payload_signer.h
index 38c673c..b2d6606 100644
--- a/payload_generator/payload_signer.h
+++ b/payload_generator/payload_signer.h
@@ -77,8 +77,7 @@
   // Returns the length of out_signature_blob that will result in a call
   // to SignPayload with the given private keys. Returns true on success.
   static bool SignatureBlobLength(
-      const std::vector<std::string>& private_key_paths,
-      uint64_t* out_length);
+      const std::vector<std::string>& private_key_paths, uint64_t* out_length);
 
   // Given an unsigned payload in |payload_path|,
   // this method does two things: