Revert "Pin messaging to use Jack with 1.7 language"

This reverts commit ef3cc713d4dc47a2d6a7539afdddab84a67a9ced.

Bug: 27333568
Bug: 27305482
Bug: 26753820
Change-Id: I696102ce7aba6ba01f95abd2c9705fb448499856
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))