Reduce the scope of proguard rule to fix the broken build.

Change-Id: I27506dc26875d320a61d5d016f72bb2d221ca4d1
diff --git a/proguard.flags b/proguard.flags
index ad6f727..f1a3eaf 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -86,7 +86,8 @@
 # next row when focus is on the last item of last row when using a RecyclerView
 # Keep optimized and shrunk proguard to prevent issues like this when using
 # support jar.
--keep,allowoptimization,allowshrinking class android.support.** {
-  *;
-}
+#-keep,allowoptimization,allowshrinking class android.support.** {
+#  *;
+#}
+-keep class android.support.v7.widget.RecyclerView { *; }