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/block_mapping.h b/payload_generator/block_mapping.h
index 3fe94ab..3738f6f 100644
--- a/payload_generator/block_mapping.h
+++ b/payload_generator/block_mapping.h
@@ -53,7 +53,9 @@
   // from the file descriptor |fd| starting at offset |initial_byte_offset|.
   // Returns whether it succeeded to add all the disk blocks and stores in
   // |block_ids| the block id for each one of the added blocks.
-  bool AddManyDiskBlocks(int fd, off_t initial_byte_offset, size_t num_blocks,
+  bool AddManyDiskBlocks(int fd,
+                         off_t initial_byte_offset,
+                         size_t num_blocks,
                          std::vector<BlockId>* block_ids);
 
  private: