Mark TabCloseableStateWatcherTest.CloseIncognitoBrowser as flaky

BUG=83861
TEST=no
TBR=sky@chromium.org

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86595 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/tab_closeable_state_watcher_browsertest.cc

@@ -247,7 +247,11 @@ IN_PROC_BROWSER_TEST_F(TabCloseableStateWatcherTest, SecondIncognitoBrowser) {
 
 // Tests closing an incognito browser - the incognito browser should close,
 // and a new normal browser opened with a NewTabPage (which is not closeable).
-IN_PROC_BROWSER_TEST_F(TabCloseableStateWatcherTest, CloseIncognitoBrowser) {
+// Test is flaky:
+// EXPECT_EQ(1u, BrowserList::size()) in the "Close incognito browser." block
+// currently fails in ~13% of all runs. See http://crbug.com/83861
+IN_PROC_BROWSER_TEST_F(TabCloseableStateWatcherTest,
+                       FLAKY_CloseIncognitoBrowser) {
   NavigateToURL(ntp_url_);
 
   // Open an incognito browser.