Remove some #ifdef __native_client__ on tests.

mojo/public/cpp/system/tests/core_unittest.cc

Index: mojo/public/cpp/system/tests/core_unittest.cc
diff --git a/mojo/public/cpp/system/tests/core_unittest.cc b/mojo/public/cpp/system/tests/core_unittest.cc
index 1843c374fed4f974729ae231706e390a198012e7..8dc592fad31618ac881f73f0ebd4e1f3c08701c4 100644
--- a/mojo/public/cpp/system/tests/core_unittest.cc
+++ b/mojo/public/cpp/system/tests/core_unittest.cc
@@ -544,13 +544,7 @@ TEST(CoreCppTest, WaitManyResult) {
   }
 }
 
-// TODO(ncbray): enable this test once NaCl supports the corresponding APIs.
-#ifdef __native_client__
-#define MAYBE_DataPipe DISABLED_DataPipe
-#else
-#define MAYBE_DataPipe DataPipe
-#endif
-TEST(CoreCppTest, MAYBE_DataPipe) {
+TEST(CoreCppTest, DataPipe) {
   ScopedDataPipeProducerHandle ph;
   ScopedDataPipeConsumerHandle ch;