Remove TEST_MAPPING, failing rust tests am: 19b50d7e67 am: 18f8214edc

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/rust/crates/unicode-xid/+/12295794

Change-Id: If8cfb16574c33ac6463595a5eafc7a0b7b5e9d63
diff --git a/TEST_MAPPING b/TEST_MAPPING
deleted file mode 100644
index cbf5b0d..0000000
--- a/TEST_MAPPING
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "presubmit": [
-    {
-      "name": "unicode-xid_device_tests_unicode_xid"
-    },
-    {
-      "name": "unicode-xid_host_tests_unicode_xid",
-      "host": true
-    }
-  ]
-}