Revert "Use R8 for resource shrinking"

Revert submission 2816534-r8resourceshrinking

Reason for revert: b/309075997

Reverted changes: /q/submissionid:2816534-r8resourceshrinking

Change-Id: Ic173491eaf22967fbad14fbcc85f6ddb2cf54d23
diff --git a/java/Android.bp b/java/Android.bp
index e9319d1..4450c42 100644
--- a/java/Android.bp
+++ b/java/Android.bp
@@ -66,6 +66,7 @@
         "plugin.go",
         "prebuilt_apis.go",
         "proto.go",
+        "resourceshrinker.go",
         "robolectric.go",
         "rro.go",
         "sdk.go",
@@ -105,6 +106,7 @@
         "plugin_test.go",
         "prebuilt_apis_test.go",
         "proto_test.go",
+        "resourceshrinker_test.go",
         "rro_test.go",
         "sdk_test.go",
         "sdk_library_test.go",