Fix the ChromeFrame FullTabModeIE_TestDownloadFromForm test flakiness on IE9.

TBR=amit

Review URL: http://codereview.chromium.org/4980004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@66311 0039d316-1c4b-4281-b951-d872f2087c98

chrome_frame/test/test_with_web_server.cc

@@ -1240,9 +1240,11 @@ TEST_F(ChromeFrameTestWithWebServer, FullTabModeIE_TestDownloadFromForm) {
   };
 
   EXPECT_CALL(win_observer_mock, OnWindowOpen(_))
+      .Times(testing::AtMost(1))
       .WillOnce(chrome_frame_test::DoCloseWindow());
 
   EXPECT_CALL(win_observer_mock, OnWindowClose(_))
+      .Times(testing::AtMost(1))
       .WillOnce(QUIT_LOOP(loop_));
 
   SimpleWebServerTest server(46664);