Bug 1302189 - [2.3] Prevent ProGuard from optimizing out native resource references. r=kats

mobile/android/geckoview/src/main/java/org/mozilla/gecko/mozglue/NativeZip.java

@@ -17,6 +17,7 @@ public class NativeZip implements NativeReference {
     private static final int STORE = 0;
 
     private volatile long mObj;
+    @JNITarget
     private InputStream mInput;
 
     public NativeZip(String path) {