updater_sample: add proguard.flags

Test: junit
Change-Id: I0175271935fdd87dd49ad9936d0e1b550d164e05
Signed-off-by: Zhomart Mukhamejanov <zhomart@google.com>
diff --git a/updater_sample/tests/Android.mk b/updater_sample/tests/Android.mk
index 9aec372..4157604 100644
--- a/updater_sample/tests/Android.mk
+++ b/updater_sample/tests/Android.mk
@@ -22,10 +22,10 @@
 LOCAL_MODULE_TAGS := tests
 LOCAL_JAVA_LIBRARIES := \
     android.test.base.stubs \
-    android.test.runner.stubs \
-    guava
+    android.test.runner.stubs
 LOCAL_STATIC_JAVA_LIBRARIES := android-support-test \
-    mockito-target-minus-junit4
+    mockito-target-minus-junit4 \
+    guava
 LOCAL_INSTRUMENTATION_FOR := SystemUpdaterSample
 LOCAL_PROGUARD_ENABLED := disabled