Fix for 3303 MultithreadedParallelIsolates has a race condition.

test/cctest/cctest.status

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@@ skipping 12 matching lines @@
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 [
 [ALWAYS, {
   # All tests prefixed with 'Bug' are expected to fail.
   'test-api/Bug*': [FAIL],
 
-  # BUG(3303). Crashes on mac builds, known race condition.
-  'test-lockers/MultithreadedParallelIsolates': [SKIP],
-
   ##############################################################################
   # BUG(382): Weird test. Can't guarantee that it never times out.
   'test-api/ApplyInterruption': [PASS, TIMEOUT],
 
   # TODO(mstarzinger): Fail gracefully on multiple V8::Dispose calls.
   'test-api/InitializeAndDisposeOnce': [SKIP],
   'test-api/InitializeAndDisposeMultiple': [SKIP],
 
   # These tests always fail.  They are here to test test.py.  If
   # they don't fail then test.py has failed.
@@ skipping 275 matching lines @@
   'test-api/Float32Array' : [SKIP],
   'test-api/Float64Array' : [SKIP],
   'test-api/Regress2333' : [SKIP],
   'test-alloc/StressHandles' : [SKIP],
   'test-alloc/StressJS' : [SKIP],
   'test-accessors/HandleScopePop' : [SKIP],
   'test-accessors/Gc' : [SKIP],
 
 }],  # 'arch == nacl_ia32 or arch == nacl_x64'
 ]