Updated to GVR 1.0 SDK

third_party/gvr-android-sdk/proguard/base.flags

Index: third_party/gvr-android-sdk/proguard/base.flags
diff --git a/third_party/gvr-android-sdk/proguard/base.flags b/third_party/gvr-android-sdk/proguard/base.flags
deleted file mode 100644
index 6ae223f5000b8d4864917bb8b49fb53e1b573183..0000000000000000000000000000000000000000
--- a/third_party/gvr-android-sdk/proguard/base.flags
+++ /dev/null
@@ -1,10 +0,0 @@
-# Proguard rules for commonly-shared libraries in gvr.
-
--keepattributes *Annotation*
-
-# Keep natively accessed methods used by GVR.
--keep class com.google.vr.cardboard.UsedByNative
--keep @com.google.vr.cardboard.UsedByNative class *
--keepclassmembers class * {
-    @com.google.vr.cardboard.UsedByNative *;
-}