Update android.jar for Android S

Content of README.google:

Name: Android system library jar
URL: https://developer.android.com/studio/index.html
Version: API version S (preview revision 4)
Revision: NA
License: Apache License Version 2.0

Description:
This is the android.jar pulled using the android sdk manager.
Change-Id: Ia4cbaf2792a315905b091a461eb38387787eb41a
diff --git a/third_party/android_jar/lib-v31.tar.gz.sha1 b/third_party/android_jar/lib-v31.tar.gz.sha1
index 20eb896..0af2989 100644
--- a/third_party/android_jar/lib-v31.tar.gz.sha1
+++ b/third_party/android_jar/lib-v31.tar.gz.sha1
@@ -1 +1 @@
-758bc25bf1aa97fab86205b0dd5db396f9b129cd
\ No newline at end of file
+3f0543d825941eee32abca750ce30e83ed451f30
\ No newline at end of file