Revert "Disable test after failing test was pushed."

This reverts commit fd825201137046db7ffa4371ad6d374beda89735.

The change that fixes this test has been submitted.

Change-Id: I35612987b6b149f538b6c6d757eaa626b5349bbd
diff --git a/tools/libcore_failures.txt b/tools/libcore_failures.txt
index f0afba5..6d67f84 100644
--- a/tools/libcore_failures.txt
+++ b/tools/libcore_failures.txt
@@ -266,11 +266,5 @@
           "libcore.util.NativeAllocationRegistryTest#testNativeAllocationNoAllocatorAndNoSharedRegistry",
           "libcore.util.NativeAllocationRegistryTest#testNativeAllocationNoAllocatorAndSharedRegistry",
           "libcore.util.NativeAllocationRegistryTest#testNullArguments"]
-},
-{
-  description: "Expected to fail",
-  bug: 26869497,
-  result: EXEC_FAILED,
-  names: ["libcore.java.util.CalendarTest#testSetHourOfDayInEuropeLondon"]
 }
 ]