Revert "Merge pull request #24568 from veblush/test-xds-abseil"

This reverts commit 9083de5017, reversing
changes made to 913760a6a9.

test/cpp/end2end/xds_end2end_test.cc

@@ -4245,6 +4245,9 @@ TEST_P(LdsRdsTest, XdsRoutingClusterUpdateClustersWithPickingDelays) {
 }
 
 TEST_P(LdsRdsTest, XdsRoutingApplyXdsTimeout) {
+  // TODO(https://github.com/grpc/grpc/issues/24549): TSAN won't work here.
+  if (BuiltUnderTsan()) return;
+
   const int64_t kTimeoutNano = 500000000;
   const int64_t kTimeoutGrpcTimeoutHeaderMaxSecond = 1;
   const int64_t kTimeoutMaxStreamDurationSecond = 2;