Remove TimeZoneTest#testSetDefaultRace from blacklist

- The test is no longer time sensitive

Bug: 62528691
Test: cts-tradefed run cts -m CtsLibcoreTestCases --test
libcore.java.util.TimeZoneTest#testSetDefaultRace
Change-Id: I78b5ac6ef475b5565325de6cb6b6d07061169429
diff --git a/tools/libcore_failures.txt b/tools/libcore_failures.txt
index c6553f8..ea26b0e 100644
--- a/tools/libcore_failures.txt
+++ b/tools/libcore_failures.txt
@@ -211,13 +211,6 @@
           "libcore.java.lang.ProcessBuilderTest#testRedirect_nullStreams"]
 },
 {
-  description: "Test is timing sensitive",
-  result: EXEC_FAILED,
-  bug: 62528691,
-  modes: [device],
-  names: ["libcore.java.util.TimeZoneTest#testSetDefaultRace"]
-},
-{
   description: "Repeated annotations do not work in javac (OpenJDK8), fixed in OpenJDK9.
                 Blacklisted to support javac/dx build (b/36902714)",
   result: EXEC_FAILED,