Update D8 and R8 to 1.2.19-dev

Version: master 281fbc18618bd0dfc2707f3074c7f09a629b3754
This build IS NOT suitable for preview or public release.

Built here: go/r8-releases/raw/master/281fbc18618bd0dfc2707f3074c7f09a629b3754

Test: m -j PRODUCT-aosp_arm64-eng core-oj
Change-Id: I3056b5e398e1a91f38cd7144afe4c4ae0b865a63
diff --git a/LICENSE b/LICENSE
index 46c1127..71cdf6d 100644
--- a/LICENSE
+++ b/LICENSE
@@ -37,11 +37,11 @@
   copyrightHolder: The Guava Authors
   license: The Apache Software License, Version 2.0
   licenseUrl: http://www.apache.org/licenses/LICENSE-2.0.txt
-- artifact: com.googlecode.json-simple:json-simple:+
-  name: JSON.Simple
+- artifact: com.google.code.gson:gson:+
+  name: Gson
   license: The Apache Software License, Version 2.0
   licenseUrl: http://www.apache.org/licenses/LICENSE-2.0.txt
-  url: http://code.google.com/p/json-simple/
+  url: https://github.com/google/gson
 - artifact: it.unimi.dsi:fastutil:+
   name: fastutil
   license: Apache License, Version 2.0