Revert "Pin messaging to use Jack with 1.7 language"

This reverts commit 445d7baabc65ffec355e47d0452bafa0f6804923.

Bug: 27333568
Bug: 27305482
Bug: 26753820
Change-Id: I44c126c3a54de332c0032e1d7d158f95099bfc03
diff --git a/Android.mk b/Android.mk
index 64f1935..e2ed18b 100644
--- a/Android.mk
+++ b/Android.mk
@@ -81,9 +81,6 @@
 
 LOCAL_SDK_VERSION := current
 
-# Workaround for http://b/27305482
-LOCAL_JAVA_LANGUAGE_VERSION := 1.7
-
 include $(BUILD_PACKAGE)
 
 include $(call all-makefiles-under, $(LOCAL_PATH))