Track libcore change b5d045f7e4023c0ba9a42fb95efad4c30dfc085f

Change-Id: I40bfd7f85c3972cb21c1ddde07ae9b5727df8909
diff --git a/tools/libcore_failures.txt b/tools/libcore_failures.txt
index 44206df..e6394a9 100644
--- a/tools/libcore_failures.txt
+++ b/tools/libcore_failures.txt
@@ -272,5 +272,10 @@
           "libcore.util.NativeAllocationRegistryTest#testNativeAllocationNoAllocatorAndNoSharedRegistry",
           "libcore.util.NativeAllocationRegistryTest#testNativeAllocationNoAllocatorAndSharedRegistry",
           "libcore.util.NativeAllocationRegistryTest#testNullArguments"]
+},
+{
+  description: "Only work with --mode=activity",
+  result: EXEC_FAILED,
+  names: [ "libcore.java.io.FileTest#testJavaIoTmpdirMutable" ]
 }
 ]