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/extent_ranges.h b/payload_generator/extent_ranges.h
index 02cf8fc..62ffff4 100644
--- a/payload_generator/extent_ranges.h
+++ b/payload_generator/extent_ranges.h
@@ -57,9 +57,9 @@
   void AddExtents(const std::vector<Extent>& extents);
   void SubtractExtents(const std::vector<Extent>& extents);
   void AddRepeatedExtents(
-      const ::google::protobuf::RepeatedPtrField<Extent> &exts);
+      const ::google::protobuf::RepeatedPtrField<Extent>& exts);
   void SubtractRepeatedExtents(
-      const ::google::protobuf::RepeatedPtrField<Extent> &exts);
+      const ::google::protobuf::RepeatedPtrField<Extent>& exts);
   void AddRanges(const ExtentRanges& ranges);
   void SubtractRanges(const ExtentRanges& ranges);