Disable PrerenderBrowserTest.MatchCompleteDummy on OS X due to flaky timeouts

chrome/browser/prerender/prerender_browsertest.cc

Index: chrome/browser/prerender/prerender_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_browsertest.cc b/chrome/browser/prerender/prerender_browsertest.cc
index ea14ea54ec500db5e030fdb9520aaeed731afe4c..2db887ccf183f9127463f11e74b6c01611537809 100644
--- a/chrome/browser/prerender/prerender_browsertest.cc
+++ b/chrome/browser/prerender/prerender_browsertest.cc
@@ -2290,7 +2290,13 @@ IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, MAYBE_ControlGroup) {
 // a prerender is cancelled because of a script, a dummy must be created to
 // account for the MatchComplete case, and it must have a final status of
 // FINAL_STATUS_WOULD_HAVE_BEEN_USED.
-IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, MatchCompleteDummy) {
+#if defined(OS_MACOSX)
+// http://crbug.com/142912 - Times out on Chrome Mac release builder
+#define MAYBE_MatchCompleteDummy DISABLED_MatchCompleteDummy
+#else
+#define MAYBE_MatchCompleteDummy MatchCompleteDummy
+#endif
+IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, MAYBE_MatchCompleteDummy) {
   std::deque<FinalStatus> expected_final_status_queue;
   expected_final_status_queue.push_back(FINAL_STATUS_JAVASCRIPT_ALERT);
   expected_final_status_queue.push_back(FINAL_STATUS_WOULD_HAVE_BEEN_USED);