Marking the AboutChromeFrame test flaky.

chrome_frame/test/chrome_frame_unittests.cc

Index: chrome_frame/test/chrome_frame_unittests.cc
===================================================================
--- chrome_frame/test/chrome_frame_unittests.cc	(revision 30782)
+++ chrome_frame/test/chrome_frame_unittests.cc	(working copy)
@@ -1479,7 +1479,7 @@
 // with the chrome revision. The test finally checks for success by comparing
 // the URL of the window being opened with cf:about:version, which indicates
 // that the operation succeeded.
-TEST_F(ChromeFrameTestWithWebServer, FullTabModeIE_AboutChromeFrame) {
+TEST_F(ChromeFrameTestWithWebServer, FLAKY_FullTabModeIE_AboutChromeFrame) {
   TimedMsgLoop loop;
 
   CComObjectStackEx<MockWebBrowserEventSink> mock;