Adopt robolectric 3.6.1

Bug: 71596155
Test: make RunKeyChainRoboTests
Change-Id: Ifcdfb9a4116ea056066721461f66eed56478d602
diff --git a/robotests/Android.mk b/robotests/Android.mk
index a6b854f..6165044 100644
--- a/robotests/Android.mk
+++ b/robotests/Android.mk
@@ -14,7 +14,7 @@
 
 LOCAL_JAVA_LIBRARIES := \
     junit \
-    platform-robolectric-3.5.1-prebuilt \
+    platform-robolectric-3.6.1-prebuilt \
     telephony-common
 
 LOCAL_INSTRUMENTATION_FOR := KeyChain
@@ -42,4 +42,4 @@
 
 LOCAL_ROBOTEST_TIMEOUT := 36000
 
-include prebuilts/misc/common/robolectric/3.5.1/run_robotests.mk
+include prebuilts/misc/common/robolectric/3.6.1/run_robotests.mk