Roll src/third_party/catapult/ 2b7a13d86..619acd2c5 (4 commits).

https://chromium.googlesource.com/external/github.com/catapult-project/catapult.git/+log/2b7a13d86594..619acd2c51c4

$ git log 2b7a13d86..619acd2c5 --date=short --no-merges --format='%ad %ae %s'

BUG=616832

TBR=catapult-sheriff@chromium.org

Review-Url: https://codereview.chromium.org/2041203002
Cr-Commit-Position: refs/heads/master@{#398208}

DEPS

@@ -96,7 +96,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling catapult
   # and whatever else without interference from each other.
-  'catapult_revision': '2b7a13d865940809a3dc68f58c9b17f4501a1489',
+  'catapult_revision': '619acd2c51c40e234ade114b164c1faaa4388e71',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libFuzzer
   # and whatever else without interference from each other.