Update screenshots for Chrome 60 (#9794)

diff --git a/tests/screenshots b/tests/screenshots
index 22411451972c80c172196361499d8403c9323c1d..52b1a4148ba8b3a6a74278e4d7d041aa6d6620b7 160000 (submodule)
--- a/tests/screenshots
+++ b/tests/screenshots
@@ -1 +1 @@
-Subproject commit 22411451972c80c172196361499d8403c9323c1d
+Subproject commit 52b1a4148ba8b3a6a74278e4d7d041aa6d6620b7