Disable test 163-app-image-methods for gcstress

Has been failing while initializing the boot classpath. Not clear
why yet.

Test: test-art-host

Change-Id: I2755ae0a065c33a3fe88a1ade6301531c13c4fb0
diff --git a/test/knownfailures.json b/test/knownfailures.json
index 87d857e..9c50a71 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -100,6 +100,11 @@
         "bug": "http://b/35800768"
     },
     {
+        "tests": "163-app-image-methods",
+        "variant": "gcstress",
+        "description": ["This test sometimes runs out of memory initializing the boot classpath."]
+    },
+    {
         "tests": ["908-gc-start-finish",
                   "913-heaps"],
         "variant": "gcstress",