Revert "Temporarily disable performance.now() in the d8 shell."

test/mjsunit/mjsunit.status

Index: test/mjsunit/mjsunit.status
diff --git a/test/mjsunit/mjsunit.status b/test/mjsunit/mjsunit.status
index c79ba974880325835d477b7267391e49aad9ab3e..4997753a9dc5cf49aab8a3af14dc3a3cc805a1fe 100644
--- a/test/mjsunit/mjsunit.status
+++ b/test/mjsunit/mjsunit.status
@@ -63,6 +63,11 @@
   # Only regexp stuff tested, no need for extensive Crankshaft tests.
   'regexp-global': [PASS, NO_VARIANTS],
 
+  ##############################################################################
+  # No need to waste time for this test.
+  'd8-performance-now': [PASS, NO_VARIANTS],
+
+  ##############################################################################
   # These use a built-in that's only present in debug mode. They take
   # too long to run in debug mode on ARM and MIPS.
   'fuzz-natives-part*': [PASS, ['mode == release or arch == arm or arch == android_arm or arch == mipsel', SKIP]],