Remove LegacyContactImporter

Contact data migration from donut is no longer supported.

Bug 5664971

Change-Id: I01c56752d93bb0f8e2a0e6ff81285f1971a7c893
diff --git a/proguard.flags b/proguard.flags
index f56ffff..3117066 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -11,3 +11,9 @@
 -keep class ** {
   *** *ForTest(...);
 }
+
+# Any class or method annotated with NeededForTesting.
+-keep @com.android.providers.contacts.util.NeededForTesting class *
+-keepclassmembers class * {
+@com.android.providers.contacts.util.NeededForTesting *;
+}