Remove unnecessary proguard flags

These are now exported from these libraries automatically.

Test: m Contacts; classes-proguard.jar has same contents
Change-Id: If215736e062f9ddaf0fcd63aa9b856bc25e34945
diff --git a/Android.mk b/Android.mk
index 82a5ba4..11cdd77 100644
--- a/Android.mk
+++ b/Android.mk
@@ -39,11 +39,7 @@
 LOCAL_CERTIFICATE := shared
 LOCAL_PRIVILEGED_MODULE := true
 
-LOCAL_PROGUARD_FLAG_FILES := \
-    proguard.flags \
-    ../../../frameworks/support/core-ui/proguard-rules.pro \
-    ../../../frameworks/support/design/proguard-rules.pro \
-    ../../../frameworks/support/v7/recyclerview/proguard-rules.pro
+LOCAL_PROGUARD_FLAG_FILES := proguard.flags
 
 LOCAL_SDK_VERSION := current
 LOCAL_MIN_SDK_VERSION := 21