Fix test expectations for cctest/test-debug.

BUG=v8:3125
R=bmeurer@chromium.org
TBR=verwaest@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/150173003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18935 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/cctest.status

@@ -87,7 +87,9 @@
 ['system == macos', {
 
   # BUG(3125).
-  'test-debug/*': [PASS, FLAKY],
+  'test-debug/DebugGetLoadedScripts': [PASS, FLAKY],
+  'test-debug/DebugStepLinear': [PASS, FLAKY],
+  'test-debug/DebuggerClearMessageHandler': [PASS, FLAKY],
 }],  # 'system == macos'
 
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